To leave it all in a single post, I will start from top to lowest priority.
1. Extra Credits maks no sense. The argument they use implies they think black people are inferior to other humans. Why? Because the reason orcs and other evil races are considered evil is because they lack humanity.
From their perspective, they are not evil. And in fact there are several worlds of fiction where they are depicted, not as evil, but as in conflict wiht humans.
With that said, I will argue a purely evil race is hard to write for me without feeling an ounce of guilt, unless they are something like ants or shapeless piles of blubber. Because whenever I write humanoids, I think of the potential of waifus in their species and refuse to write them as evil.
Want to end the evil race trope? Promote monster girls.
Second. On violent video games breeding mass shooters, and how it extends to other arguments. Last time I checked, most mass shooters didn't even care much about video games.
In fact a 2019 case I didn't know about until recently (Because it got popular in my country) involved a trans woman and an antisocial guy with TDS. They weren't even gun totting right wingers. No. They were leftist LGBT activists in their teenage years radicalyzed by news outlets. So… Let's just say videogames encourage no violence.
And it can extrapolate to most things. Contrary to what people say, porn does not encourage misogyny. In fact it seems to encourage the opposite since it makes men feel affection to the actress on screen. (Because, to no one's surprise, sex and affection are correlated). And, both based on statistics and real life, loli art does not encourage child sexual abuse.
These excuses for censorship take things we know are wrong, and tie them to things which are unrelated so that they can censor them. Meanwhile the proble will just get worse.
On the GmaerGate documentaries. The reason they claim GamerGate started it all is because it started it all to the masses. Before it, the average citizen didn't notice the creeping corruption and forced agendas. They just went by without caring, more often than not because it didn't affect them. That's why people like Sargon, Metokur, and Thunderfoot were already talking about these things but a fair share of people didn't listen.
Then came GamerGate. It confirmed the suspicion of some, especially within comics, and revealed the facts to many. And thus the first wave of actual counter movement started. Ever since then, GamerGate itself is no longer of relevance, but the culture war emerged in public discourse, and, to the chagrin of both SJW classic and the current puritans, it is threatening their authoritarian goals.
That's why the puritans keep talking about GamerGate. Because, for them, it never ended. It just grew into something they fear. Legitimate oposition and criticism.
Finally, on the AltRight. It existed before GamerGate. It was basically people on the right who thought the current right wing politicians betrayed them. Some were just right wingers, and others were full blown right wing SJWs. The later have gained more power within it, but the movement not only existed before GamerGate, but was entirely separate.
Itdid find common ground on many right wing gamers and conservatives which were legitimately upset by the evident left wing bias which emerged in their scapism since 2010. But they were both separate and in some cases in opposition.
For example, while most right wing gamers actually supported eroge and fan service, most AltRight conservatives actually want to censor erotic material in general. Therefore they pay a blind eye to such censorship.
One of the tools of propaganda and agenda pushers is misinformation. And tehy are doing the best to keep the propaganda machine running.