User blog comment:D.Dragon123/Why Haoshoku haki is useless./@comment-1595565-20130114185345/@comment-1595565-20130114204359

It's a rare trait, like being left-handed or having AB- blood. People are naturally surpised by stuff like that. You don't go around assuming everyone you meet is left-handed, which is why you're surprised when you meet someone who is. The only difference here is that this haki is dangerous to other people (and not hereditary).