I was thinking of the democracy-theoretic reason for the function here or on Reddit (the main examples I can think of at the moment), but then I remembered:
- When we vote for political officers, we tally upvotes only; it's not like the US president, for example, is decided by a ratio of upvotes to downvotes. Or, then, I've never heard of actual negative political voting (the notion is discussed in the linked SEP article, granted, but the Wikipedia article on disapproval voting seems to list only one obscure historical example in this vein, a temporary measure in the USSR).
- The thumbs-up/thumbs-down imagery on Reddit (or implicit elsewhere) hearkens back to Roman gladiator fights, doesn't it? Not the most inspiring tradition to base a practice on.
A further consideration: §2.3.1 of the SEP article on social-networking ethics reads:
... contemporary debates about social media’s alleged propagation of a stifling ‘cancel culture,’ which bend back upon the philosophical community itself (Weinberg 2020, Other Internet Resources), reflect growing anxieties among many that social networking environments primarily lack affordances for forgiveness and mercy, not judgment and personal accountability. Yet others see the emergent phenomenon of online collective judgment as performing a vital function of moral and political levelling, one in which social media enable the natural ethical consequences of an agent’s speech and acts to at last be imposed upon the powerful, not merely the vulnerable and marginalized.
Is that what happens on Reddit, or here on the SE, though? On Reddit, for example, QAnon was ostensibly driven out after their rhetoric (surprisingly rapidly) escalated to thinly veiled, or even outright open, incitement of violence. However, the cult didn't actually vanish from Redditspace but largely dispersed throughout a variety of subreddits, including (perhaps especially) the main one devoted to conspiracy theories. The ability to downvote QAnon lurkers when they rear their heads doesn't seem particularly effective at dissuading them from further propaganda efforts, much less at improving their attitude more generally. On the SE network, the saga of Monica Cellio (a rabbit hole I'd passed by many times before but that I delved into this morning) might or might not be directly pertinent to the ethical problem of downvoting, but insofar as her expulsion could be interpreted as a sort of negative meta-vote (by the SE administration), then it doesn't seem like the most pragmatic move to have made for the stated reason (I can't tell if she did anything genuinely malignant, for starters; and even if she did something wrong or worrisome, this fact was not made clear enough to onlookers and so negativity towards her arguably did not effectively serve the intended purpose).
So did "canceling" (or trying to do so) QAnon, or Monica Cellio, or whoever, "speak truth to power" effectively? Is this entire question too cutting-edge, so to speak, to be answered at this time, so that we'll have to wait and see about whether the moral quality of Internet discourse is further compromised, on average, for the better or worse, in connection with downvoting functions? I swear there were a few years, maybe before GamerGate, where it looked to me like the average was improving. I've been "terminally online" since my adolescence, so I've tried to keep up with these trends since then (when I was 10, my parents withdrew me from public school, moved to a remote island, and dissociated from all neighbors, church groups, and mostly even our relatives, so my socialization occurred almost entirely via the Internet), and that's what my "intuition" says (that there was a "grace period" when Internet discourse was positively weighted on balance), but I don't think I can trust my intuition too much in this case.
Clarification: one of Myspace's notorious features was the ranked friends list. I admit that it would unsettle me (or worse) to see someone I thought of as my best friend ranking me below others upon whom he relied less than he did me; but anyway, one of the reasons I gravitated towards Facebook "in the end" was the absence of such rankings. To boot, I appreciated that they had a Like function but nothing, at the time, in the way of Dislikes, and it has unsettled me all over again, although now indirectly, that Facebook shifted to having the ambivalent Laugh and Anger reactions available for posts. I have even wondered how much that change coincided with the seeming degeneration of Internet discourse, whether it was an effect or cause of this degeneration (probably both, but then to what extent either way?).
So the impact of social media on dopamine processes plays into my unsettlement overall. I surprised myself today to see that my upvote/downvote ratio here on the SE is roughly 1000-to-40; but then I know that I am wary of casting downvotes, not only due to the risk of a minor loss of my own score, but also because my mirror neurons are so entangled with my Internet sense that the thought of downvoting someone else makes me feel the kind of negative dopamine rush that they might feel were I to actually cast a downvote, and so it's hard for me to agree to express that kind of hostility online. (I'm slightly less ill-disposed towards Reddit downvoting, simply because of how easy it is to get a massive score there and anyway the score fluctuations are much closer to continuous than discrete in appearance; even so, I admit as well that any downvotes that I receive on Reddit weigh on me, regardless of whether I know they came from trolls or not.) Supposing that there is some kind of ethical responsibility involved in being able to influence other people's dopamine systems as such, then is the "weirdness" of downvoting, modulo the democratic ideal that theoretically allows for it, a function of the awkwardness some of us feel when it comes to such an influence? To my knowledge, one of the lawsuit situations Facebook faces (or could soon face) has to do with teenagers who have suffered various psychological/emotional damages in connection with social media usage. Is that danger(?) where my intuition of "moral weirdness" is coming from?