1) Excuses excuses. Of course it's different if the woman herself doesn't want to come forward, but let's cut with the dumb suffering artist act. Ben Affleck hasn't been "starving artists works at Reseda" level of actor in decades.
2) It's not just the fact that no one did anything, it's Affleck's "oh if only anyone knew this was happening" act that makes it even worse. Hollywood knew. This shit doesn't stay a secret. People might not talk publicly, but they talk privately and that shit spreads like a forest fire. He doesn't get to act as if he would've been the saviour if only someone had just powered up the bat-fucking-signal. He knew, didn't do anything but tries to come out on the other side looking like one of the good guys.