I think you already know the answers/arguments on this, so I'll be brief. Parents cannot supervise children 24/7, not when the radio, television, internet, even (in many places) the schools are all suspect. So the broad question is whether society is going to be child-friendly or child-hazardous. Since America kills a quarter of its children before birth, we already know the answer to that, don't we?
When I was growing up in the 50's and early 60's, society outside the home was, by and large, child-friendly. It supported parents. The schools were safe places. Television was safe. The radio was safe. Libraries were certainly safe. There was no internet, but had there been, it too would have been a safe zone. Newstands, including the racks at the grocery story checkout counters, didn't shout sex at you. I can recall the discussions along about in junior high, when some of the boys were discovering Playboy, about where you could get this mysterious magazine (under the counter at a couple of stores, and you had to ask for it).
A different world. People who wanted porn could get it, but it was an opt-in type of thing; you had to go looking just a bit. Now the public culture is sex, sex, sex 24/7, and parents basically have to put a bag over their kids heads and lock 'em up to avoid five and six year olds being barraged with sexual messages. Does anybody really think this is better?