> I know parents who have no problem with their kids seeing porn.

Surely you mean at least teenagers, and not literally children, right? Consider the prevalence of violence, racial stereotyping, and escalation of fetishism into degeneracy that clearly exists within this medium; what's the line that these parents draw? Are they making sure it's only something vanilla? Or is there no line whatsoever?

They don't care. The kids won't think to ask until they are teens, and they are not showing it until then, but it is technically available.