You and everyone else has lived with transgender people all your lives, on the street, in public bathrooms and everywhere else where public facilities exist. and your overblown paranoia hasn't resulted in you even noticing the transgender people around you everywhere you go.
Hate to break it to you, but you've been in the bathroom with other trans people, you've likely been in a locker room with them too, and you haven't, to this point, had your imaginary fears come to fruition.
Transgender people didn't just suddenly appear on the planet to justify sick and evil people like Minnery who would exploit your ignorance in order to create fear that drives your imagination to create fantasies that have no basis in reality.
Grow up.