Ok, here's the thing: I don't even
have huge moral problems with piracy, but it is
very illegal. And "just generally being assholes" should damn well be labeled as a
guilty pleasure, at least as it regards 4chan's interaction with the world outside 4chan.
Likewise, many people have no actual problem with smoking crack. That doesn't mean it's not illegal, and it doesn't mean there's no good reason people don't want to live next to a crack house. Or even a dive bar, for that matter.
Consistent cross-site raids conducted by sites like 4chan and SomethingAwful (and worse: hate groups are some of Reddit's most regular raiders) definitely do create the effect of having a virtual "bad neighbor".
I enjoy 4chan too, after having finally getting over being a newfriend (printing the polite version of that term) since half my IRL friends are anons. This doesn't mean I don't know damn well the site is a guilty pleasure and I shouldn't actually let myself get sucked into the Internet Hate Machine.