"Won't someone please think of the children!"

There are legitimate privacy and rights concerns to the legality of filming in public spaces (especially in this era of "big data"). None of them are exclusive to children.

Also note that parent was discussing the legality of filming, which is independent of the... interesting social moires you espouse.

I didn't express any emotion or "feel" anything in that sentence, I was stating a fact that (in the US and Canada) streets are public places, and you can't legally do the things mentioned.

Dude, I'd kill hundreds to save my child. That doesn't mean I have to allow people to kill hundreds to save their child. The whole point is to make rules when you're rational so that when you're acting on biological instinct or emotion the rules constrain you.

In fact, that's underselling it. If it's my child's leg or your life, you're going to die. That's why I don't get myself into this situation in the first place.

That doesn’t change the legality much

Its easy to be and stay principled when you're not the victim.