In a way ,Critics help people to improve . If some body is not criticised, then he /she is not thinking /speaking /doing anything and not active at all.
Normally, 'People find what they look for!'. Critics normally look for Negative points only and they always find some or the other negative issues with some body or the other.
But, most of the Critics are desperate in their Profession and Life ! Probably, they wish 'All others to be in the same pathetic condition what they are in !'.