To understand how this kind of shit becomes defensible, you have to understand how Social Justice works on a strategic scale. It always has an agenda, but the likes of Social Justice infiltrating something, be it Vidya Gaems, Comics, Atheism, etc are not done in a vaccuum. I learned this mostly by watching Vade, but it's just as true of every single fucking Anti-GGer ever, so it holds water.
When Social Justice wants a foothold in something, traditionally to turn it into a mouthpiece and then an attack platform, it's a slow and often gradual process, one that is missed by onlookers who aren't aware of what's up. It always, invariably, begins, however, with a solo operative. In the case of FurryScumbags with Vade, this was Vade herself. In the case of SJWs in gaming or comics, it usually begins as one individual who was either a "diversity coordinator" or some other form of consultant.
After a short time of relative placidity, this initial operative will immediately - and often very quietly - engage in various forms of cronyism and outright subversion. Because Social Justice is heavily collectivist by nature, often to the point where it makes absolutely no sense, this cronyism is seen as a forgivable sin and necessary evil. What's more important is getting a beachhead established, and towards this end, the initial operative will act by working to convert sympathetic operatives and then promoting and/or hiring people who are 100% on-board with the Social Justice agenda. Anyone who opposes them are likely to be belittled and undermined actively, in an attempt to reduce their prominence or power. If the opposing force is the leader of a group, then SocJus operatives will rely upon the generally docile nature of the majority not paying super-close attention to push forward, until they can essentially render the opposing elements moot.
This continues until Social Justice controls a given community in its entirety. At this point, whatever the original purpose of the community, regardless of what it originally was designed for, who its original userbase was, et al, it will be turned into nothing more than an attack platform for further Social Justice operations.
For the ur-example of what a community looks like after SJWs have full control, take a good look at NeoGAF.
The thing is, they often run into resistance at some point. Communities with more individualistic or compartmentalized userbases are more likely to resist SJW incursion, and rightly see it for the attempt at colonization it basically is. Addititionally, Social Justice is never the majority on a given community. Ever. However, because it's so loud and so good at leveraging its yelling, it gets people to surrender via the equivalent of an angry mob's justice. They know they can't win via a fair fight, so they'll avoid having one at all costs. Towards this end, Social Justice actively attempts to enact ideological conformity and is noted for using specialist language - the ongoing Kiwi Farms glossary of SJW terminologies expands literally by the day because SocJus is always inventing new terms. This is intentional, since many "line" SJWs have large bodies of literary and/or academic work intended to baffle people who aren't familiar with these works and terms and browbeat them into simply agreeing rather than argue.
Because of that original sin that SocJus allows - cronyism for the so-called "greater good" - every other personal sin committed by Social Justice operatives quickly winds up dismissed the same way, and winds up put into the same category - until the point where they're defending pedophiles, ignoring it when one of them is caught openly breaking the law, or when they laugh off being openly disproven in the court of public opinion. That initial opening props the floodgates over, and atrocities soon follow.
In the minds of a Social Justice Warrior, it's all acceptable for a victory on the bigger front, so everything becomes a case where the end justifies the means. Remember how Bob Chipman once said that he felt there was no bad tactics? That's true of almost all SocJus lunatics. Deception, intimidation, and even outright violence are considered fair game because of this. A case like Vade's, where there's community-wide backlash is actually fairly rare and somewhat of an outlier.
Because of how this mindset gets integrated and because of the belief that it's all for the greater good, SJWs are capable of chilling levels of doublethink, and outright acts of zealotry. In their eyes, anyone who does not back SJW talking points is, in and of themselves, embracing a position of lesser morality, so they have no respect for minority dissenters or anyone who distances themselves from the narrative too much. In this regard, SJWs are some of the biggest hypocrites, since they actively attempt to "other" their critics and dismiss them outright. We've all seen and joked about "internalized misogyny" and "Listen and Believe," but their mindset specifically details that anyone who disagrees with them is either someone so stupid they cannot be trusted to speak for themselves, or someone who is an enemy and must be vanquished.