A similar question to this may have been asked already, but nonetheless, here it is. And in advance, don't take this poorly, because I say it with love in my heart -- love for my many INTJ friends (and my INTJ roommate).
Almost all of the INTJs I know have a tendency to laugh at people's stupidity instead of trying to fix their stupidity. I mean, they'll still comment on it, but they may not suggest alternatives, because they're too busy joking around about the problem. I've seen this in real life as well as on the forum (and I've seen it with a few ENTJs, too). It always surprises me (even though it shouldn't), because with Te secondary, shouldn't INTJs be more likely to try to fix perceived imperfections?
The closest I can come to an answer is that maybe it comes from a sense of futility; people are going to be stupid no matter what, so you might as well find the humor in it. Is that close to the answer to my question, or am I totally off base?
Note: I have an INTJ aunt who is a very strong exception to this rule; she is without a doubt the most obsessive, meddling, worrying, and EXTREMELY type 1w2 person I have ever met.
Another note: My question is coming from a pretty biased position, since I am also a type 1 and therefore I have a tendency to feel like I'm morally obligated to interfere if something is being done incorrectly; i.e. I have a hard time finding the humor in watching stupid people be stupid. It's like fingernails on a chalkboard.