I could go down a longer list: because mob rules is a not-so-good policy for quality reading material, because if one group votes on agreement and another group votes on quality then the agreement group "drowns out" the quality group, because it takes about 2 seconds to determine whether you agree with something, whereas determining if something is worth reading takes a lot longer (and is more valuable information), etc.
Note that I upmodded you, even though I take issue with your position. That's because you asked a good question. In another world, I'd just downmod you because I thought you were mistaken and for most readers the question would never have been asked (or answered)