Cethin

No, bulls didn’t exist then.

Well, back then there was more oxygen in the air, which allowed tornados to grow larger.

A slippery slope isn’t always a fallacy. Yes, that is a specific name of a fallacy, which people commonly point out, but it is also the form of a valid logical argument. If there is support that this will happen, it isn’t a fallacy.

I this case, a user-entered field is useless to “protect children” (being generous and assuming this is the actual reason for the laws). Children will just lie, as they have been doing for decades. The state will point to this as the law not fulfilling its stated goals, so they’ll need to verify age through other means. Even if the goal isn’t surveillance of people, this is still likely to be the result logically. This means the slippery slope argument is valid.