Because you are not vetting, in any sense of the word. More like a little dog running around crazily peeing on fire hydrants, fences, legs... everything, just to let people know you are here. There is no call for it.
Vetting vs. pooping on threads, cannot you tell the difference? Do yourself a favor and don't do a drive by poop, explain. Sincerely, you are not the only one with an opinion. Take the time to explain if you care so much.
Do you go around on threads about Obama telling people they are pooping on them? I guess all liberals should be free from any criticism in your world.