Specifically because it is completely indefensible.
Even on this thread, there is an element of "Carrie Stevens was a Playmate, so she should expect this stuff" and there is always a simple "boys will be boys" or "everybody does it".
But grown men molesting young boys? No one -- no one -- is going to stand up and say "What's the problem? It's no big deal." It's a definite nuke.