Well, it's usually quite telling in regard to the actual level of knowledge someone is at. It's an ego based defense mechanism.
A closed mind. A need for recognition and always being right etc..
"You have offended and hurt the feelings of those who do not agree with you and frankly know nothing of what you speak, so I'm afraid you must die. "
Oh , I fully understand what it is and where it gets it’s origins, just can’t wrap my head around that mindset .