It's because the left has moved so far left that it makes the republicans look like centrists.

And the obvious answer: you have no allies on the left. It's a sad truth. They can't even define what a woman is. And this is coming from someone who has voted with the left all her life but won't be voting that way anymore because where I live (Canada) we don't have women-only spaces anymore. We can't even profess our love for a famous woman on a billboard without censorship taking it down. If I accidently misgender someone I can be charged with a hate crime. They're planning on criminalizing conversations between parents and their children about transitioning (claiming that a single conversation counts as "conversion therapy"). They're criminalizing speech!! The left loves censorship, and this is coming to a policy near you if you let it.

Say what you will about Donald Trump, but at least he's standing up for free speech. If you don't have free speech, you can't meaningfully talk about anything. If you don't have free speech, you've got nothing.

edit: And I don't think the left is maliciously trying to be "evil" by trying to take our rights away... they legit think they're helping. They're trying to please everybody to the point where they're pleasing nobody.