SJW are FAR FAR left, like communist, so if you aren't a communist you can't contribute to the Linux kernel.
I'm not sure are these SJWs so far to the left of political scene. They are not sponsored by a communist country from abroad, nor have a connections with a single orthodox left-wing party, they are not operating for the profits of left-wing groups too. But they are sponsored by companies, and companies have many profits of these groups:
First, it allows to softly and covertly limit promotions, control hierarchy and competences, successfully nullifying any employee protection laws.
Next, if it is needed to get rid of someone, just use false accusations and mob mentality, or imagine hard that they are from this bad group.
Additionally, SJW is a social engineering to direct hate in people in the order of capitalism, not socialism or communism. SJW groups direct their hate towards people who are not buying stuff from companies (or maybe even sponsors) and they should, simultaneously protecting groups who just cannot be targets for this new "torch and fork" marketing used when all other need creation methods slowly decrease in efficiency.
Let's look at the example. It is obvious that ugly people are, as in modern newspeak, "underprivileged" and it was this way all time. Are these SJWs fighting for their rights? No! According to this "social justice", it is even OK to bully ugly people. The motivation, sometimes written directly, sometimes not, is that companies may earn money by making ugly people buy more (not working) cosmetics or surgeries. This is a need creation using a new method, propagated by SJW.
Now imagine similar thing with other marketing targets, let's say using the far-right racism in its worst to sell e.g. skin change cosmetics. No way for this to work.
And it looks like that's how it works.
What will happen with Linux? Well, in 1950s in eastern block countries, there were numerous examples of incompetent factory workers who were never instructed how to use elementary tools by their colleagues, and they definitely should have been instructed. The reason was simple - experienced workers were thinking that this person, being hired without any experience, is an undercover inspection agent and it's better not to do anything suspicious, even while the new worker shown obvious signs of incompetency. And the "inspector" usually was a relative quickly hired to e.g. keep him from military service. Now, a real example, such events successfully "cleaned" one manufacturing plant of lathe operators in workshop in which 4 people were hired and, after some personnel moving, there were no people in the workshop who could use a lathe.
P.S. And for tinfoil hats, again: No, not a conspiracy, but optimization.