I think this may be in large part a negative side effect of the "gamification" because this rarely happened back when usenet posts (searched via deja or google groups) or dedicated forums for topics would be my source for finding programming answers in subjects I was unfamiliar with (new API, new language, etc). In those places if I found a question that matched mine well, and it was answered, there was a very high percentage chance the answer was correct and not just someone guessing or answering half-assedly and too quickly to get in on the karma train.
These wrongly-answered answers seem to dissuade others from answering (question too old, already sort of answered, nobody will see my correct answer and upvote it), so this wrongly answered question just lingers seemingly forever. If the moderators spent half the time pruning out these wrong answers that they do closing topics that are borderline off-topic, the site would be a far better resource for me.