If I decide not to buy a game because it looks boring, or it's not my cup of tea, or I rage against the sudden introduction of microtransactions, no one tells me to think of the devs.
If I decide to not buy a game because the creators are mired in bigotry somehow, then magically I now have to think of the developers.
It's obvious what is happening here rhetorically.
When people en masse decide to boycott a game for ethical reasons, gamers who were excited for that game suddenly feel like baddies, and they recoil at the thought of being baddies. There is no worse thing on Earth than the sinking feeling of gamers confronting the possibility that they are not little angels. But more specifically gaming is a capitalist hellscape- the most meaningful way to interact with the medium is to buy shit. As a result, there's tension- it's either taking a stand for minorities and not buying a product, or not giving up on one's consumerist desire in a hobby fraught with rabid consumerism and thus going on ahead and buying it.
So rationalization comes into play, and that rationalization has to- at the very least- come across as an ethical position versus a selfish or capitalist one, a morally noble reason to continue consuming even with minorities telling you why a specific product is harmful to their quality of life.
Thus enter "think of the devs!" After all, you wouldn't want to harm poor artists would you?
I mean, sure, artists aren't actually an oppressed minority, and the artists themselves habitually tell us they don't like being used as a shield, and yeah outside of this situation I am habitually silent and apathetic about their shitty working conditions anyway and thus really don't care about them.....but the artists matter too!
Indeed, it's not too far removed from All Lives Matter rhetoric, where the point is to downplay a specific issue by disingenuous browbeating concerning some other superficially moral issue, usually an issue that is not as pressing as the one people are trying to refute.
It is transparent as hell. So if you see it, report it.