I came here to say something like this (mostly about LaTeX), but you and the posters you're replying to said it better than I could have. I had too many posts treated as "not an appropriate question" or some such, and got tired of posting only to get my post rejected. To be sure, there are some poor posts (my first post was that, because I didn't include enough information), but the "vigilante" term you use was by and large all too appropriate.