Hi CaptainKirkssparetupee, I haven't read your whole thread but I will answer your question.
What will prevent a paedophile from sitting in a changing room watching little girls naked in a world with self-I'd is the exact same thing that prevents them doing that now. That is not, as you might think, some law that prevents men entering a female changing room. That law doesn't exist. What prevents it right now is responsible individuals with a social conscience and some common sense. That's exactly what we have right now, and we won't all become incompetent idiots overnight just because of self-Id.
It's not foolproof, it never has been, and it will be far less effective if our feminist "friends" go around spreading nonsense that challenging some dude who's been sat in the ladies' for an hour doing nothing but drooling is suddenly going to be "not allowed". That is misinformation that puts women and girls at risk. It is dangerous, and it will result in women and girls getting hurt.
It's also untrue.
If someone, penis or no penis, is doing fuck all in a changing room, or is behaving oddly, or causes you to raise an eyebrow, you have the power to challenge them and the owners of that facility have the power to throw them out for any damn reason they like forever and ever amen. That is a fact. That is basic common sense. Yes, some devious fuckers will slip through the net. No more devious fuckers than do right now. So keep on being a sensible, responsible citizen and the world will not grind to a halt.
Enjoy your thread. Please help women and children by reminding everyone that they have, and will always have, the power to exercise good judgement and common sense. Goodnight.