You don't get to, for example, run vicious media smear campaigns and organize automated blacklists of people on Twitter and still claim that you aren't aligned, at least in principal and methods, with the enemies of liberty--no matter how worthy your cause otherwise.
The other issue is that, culturally speaking, the mindset of those critical of microagressions and identity politics and other important issues also tends to dismiss or antagonize folks that are very much supportive of liberty or free speech or the right to bear arms. This ends up in a lot of sapping of resources on both sides as they fight over things as trivial as whether or not you can get married in a church.
It's actually very convenient to the folks in charge, if you want to be cynical.