I barely see anyone of note criticising the mere presence of violence in video games. Also, as I said earlier "we're simply talking about certain groups being able to even appear in games in a way that isn't a basic stereotype", is that social justice to you? That appears to be what you're presenting as being "story tropes, or character archetypes," and so social justice. I don't believe that a critique being social justice related automatically invalidates it or means that it's just someone trying to "push an agenda".
For the last three years, Ms. Sarkeesian (Perhaps you've heard of her) has published surveys on the prevalence of violent games at E3. Every year, she repeats that she wants video games to be more than what they are now, and if I'm understanding her right, combat mechanics in games block that progress:
The data is presented simply to indicate how prevalent violence remains as an element in games across the board, because when violence is seen as a core component of game design, it limits our sense of what is possible and of the kinds of stories that can be told. There remains tremendous unexplored potential for games as a medium, and it's necessary that the industry put more effort into exploring new mechanics and storytelling techniques rather than continuing to rely so heavily on established norms if the medium is ever going to achieve that potential.
The above is pushing an agenda. If she had just said: I wish there were more games that didn't focus on combat, that'd be fine, but then she claims that developers who don't listen to her and keep developing violent games are limiting the medium.
Sexualization in games is another example. Many people dislike it. Xenoblade 2 is a recent example, with people criticizing its female character designs. As always, the argument ends up being: "We don't want to take away your anime boobs, but they are reinforcing harmful stereotypes, and the people who enjoy them are creepy virgin pedophiles anyway, so they really should go."
Either you listen to them, or you're a bad person. I object to that. I'm totally fine with the devs adding alternate costumes, or even a toggle option in the menu to remove fanservice in its entirety, but you can't stop others from enjoying these kinds of elements, and yet you'll often find people advocating just that.
A lot of what you just said applies to this, actually:
In my opinion that is an inherently destructive way to live and consume art. It is stifling an artform in order to present your preconceived notions of what that artform should be. It is the gatekeeping of our culture, and leads to a place where we stop talking about ideas, because we're so obsessed with protecting gaming from those we consider to not be "true gamers", whatever that means. It isn't the death of gaming, but a kind of stagnation that comes from demanding that all art must appeal to "us" because, of course, we know better than all what gaming even is, and in doing so we lose the ability to ask the most important question of all. What should gaming even be?
And my answer to that final question is quite simple: Games should be whatever gamers (IE the people paying and playing) want it to be. And if that includes games aimed at minorities and progressives, that's fine. As long as the stuff that made the medium great in the first place isn't forced out.