Why is there always someone on this sub who tries to bring people down??

Why is there always someone on this sub who tries to bring people down?? I’ve been on this sub for a while and I noticed that when people post about accepting their stutter and feeling hopeful their is usually someone who comments something like “this is crap you know you will never be happy with a stutter no one will ever accept us our lives are worthless” Like I understand if you personally feel insecure or hopeless, but why are you trying to bring other people down who have learned to accept it and love themselves?