1. SJWism is a product of women's personality traits spiraling out of control.
We must all practice self-discipline or some of our personality traits can become monstrous. The introvert who doesn't discipline himself can easily spend his entire life alone in his room, the extrovert who doesn't discipline himself is overly concerned with other's validation, has no goals or interests other than socializing, never learns how to spend time alone to work on something.
The basic thought is that many modern women have become scared of everything, offended by everything, entitled to everything, etc. To be fair, men can also "let themselves go", hence gangs, murder, war, theft, rape, alcoholism, etc.
The reason why is blamed on everything from government, to social media over-validation, to WKs.
In this theory male SJWs are simply whiteknights looking for sex.
This theory is popular in the "blackpill"(nihilistic, cynical, negative parts of the "manosphere") communities.
2. "shit-test" theory
Women are sick of the safe, quiet, non-intimidating, hypomasculine western male. The ridiculous complaints coming out of modern feminism are supposed to push and test the modern male, in hopes that he will stand up and say enough is enough.
This theory is popular on PUA forums, bodybuilding.com/fitmisc, "redpill" sites, and the more positive/self-improvement oriented manosphere communities.
3. Jew/ mind control/ college campus theory.
We've all heard this one, brainwashing of some type is being to women by colleges or jews or somebody.
Popular in the neo-reaction, dark enlightenment, alt-right, whatever, etc.
In my opinion this theory has the least credibility of all.
4. ugly male theory
The theory that women want as much benefit from the government as possible so they don't have to settle with less attractive men for money as women did in the past.
popular with puahaters
This theory isn't good but is still less retarded than the jewish college professor conspiracy theory.