The problem (most of) those comments are addressing are not related to posts from people who have interesting problems that they can't solve, but rather students who copy-and-paste their homework assignments and demand answers. Those problems are not interesting and have no inherent value aside from helping the student get a higher grade on his homework assignment without putting any work into it. I don't care in the slightest about a student's grades or whether he "shows his work"; I'm not a high-school math teacher, and I'm certainly not his high-school math teacher.
I do, however, want this site to be genuinely about mathematics, rather than a generic homework-help site. To that end, I'm happy to keep any question that has genuine mathematical content or to help people understand mathematics; that's a worthwhile goal, and this is one of the few sites where that's possible. Questions that are simply homework problems with no real questions in them (that is, nothing specific, or a desultory "I don't know where to start" for something that's clearly a homework problem and should have been covered in the poster's class) are neither. Thus, for example, I have no problem downvoting this questionthis question. (My apologies for picking on that particular poster; that was just the first such question I found in the review queue.) There's no indication of where the student is stuck; the problem itself is a standard multivariable calculus problem that is undoubtedly completely equivalent to dozens in his notes or textbook; and the post is nothing more than "Do my homework for me!"