You’re only being “fooled” if the way that you interact with people in a social context is dependent in some way on what you imagine their reproductive-role-based-on-gamete-production is. Why do you need to know their biology if all that’s being asked of you is a polite “sir” or “ma’am?”
Because these abusive men want access to women's protected spaces , sports and rights. They do it to get off.
You have all this keen interest in biology, but zero understanding or curiosity about who trans people actually are or what they want from the rest of us. Just warmed-over 1950s propaganda about homosexual predators recycled for a new target. That’s sad in its way.
Trans people can be whoever they want to be. But they cannot usurp women's rights and protections. Or coerce kids into taking life altering drugs. They are free to believe whatever they want to about themselves. But society need not believe the same things too.