Forcing trans women to compete against cis men endangers them, because of transphobes like you who embolden the bigots who attack and murder trans people simply for being trans, and places them in situations with the cis men who in general assault both cis and trans women at alarming rates.
But again, I urge you to remember that trans MEN also exist, and compete against cis men, and piss in men's bathrooms, and they don't do this to try to sexually assault cis men—they do this just to live their fucking lives.
Meanwhile, given the statistics, you are in effectively zero danger of ever ever ever getting sexually assaulted by a trans woman. It happens so incredibly rarely that you're more likely to win the lottery. Banning them from sports and bathrooms achieves literally nothing, buys you no more safety.
But what the fuck do you think happens when you take a trans woman and force her to be in the locker room and the bathroom with cis men? Y'know, cis men? Heard of 'em? Biggest sexual predators in our species? Statistically biggest sexual assailants of both cis women and trans women?
So in order to buy yourself and other cis women statistically zero more safety, you're throwing trans women to the wolves where they'll undoubtedly be raped by cis men. You gain nothing, and you spend their lives for it. This is sociopathic. It is cruel and it is wrong. You are wrong.
Meanwhile it is so extraordinarily easy for cis men to rape women and get away with it in this miserable country. Why on EARTH would someone go through all the stigma and trauma of being trans just to achieve that? Nobody's doing that! Nobody is trans to sexually assault women! It's absurd!
In a country where rapists go free because judges say shit like "think of this boy's promising swimming career" do you really think there's any motivation or need at all for someone to be trans in order to commit sexual assault? Especially when that invites even more scrutiny and wariness.
Think. Take a moment and actually THINK, instead of squirming and squealing like a dumb trapped animal. Your fears make no sense. They are unsupported by statistics. They are unsupported by science. They are unsupported by reason. They are only supported by a shared bigotry with fascists. Be better