I'll also say this:
I think cis people have a reflexive emotional response, ground into them by a vast body of prejudices born of patriarchy, which frames "female" and "male" in very rigid ways. I think trans people's existence elicits that emotional response in a way that leaves them feeling angry and threatened because they see us as violating what they think "female" and "male" are.
And that emotional reflex, born of patriarchal bigotry, leads to every action they take against us.