Because they are normal peoples unlike abomnation who have huge amount of personal power (might makes right) humans have less or more same amount of personal power.Try arrest person you can do that try arrest abomnation will burn you and others that will try enforce laws/rules of society.
As i there is no insane leaders as such would be taken down peoples have good reason to harm someone peoples say that Hitler was villain however he was hero for many peoples when same peoples praise someone who did nasty things as well as hero.
For you one person can be villain for another hero that how it is with most peoples however abomnation is stereotypical villain in fiction he is just villain.And as i said there is no person that wanted destroy world unilike abomnation that want spread death and destruction.
This is ridiculous.
Hitler had millions of people killed and he managed to convince his country that it was a good thing, his ability to do that did not make him less dangerous it made him more dangerous.
He wasn't born into power either, he obtained it and manipulated his way into it to cause massive damage to the world that is still felt today.
I don't care who is a villain and who is a hero, I am saying being dangerous is allot more complicated than being a monster and you can't just arbitrarily claim that Abominations are more dangerous than even the worst humans.