Yes, I know that they are guided by their theology or ideology or lust for power, but what made them lose or ignore their humanity?
Maybe I'm asking the wrong question. Rather than what/why, the real question is when did they bury those traits? There's probably books and articles out there that attempts to explain it, but I have yet to read it.
The above said, they should all be erased from this planet.
"What makes human beings completely ignore their inherent emotions of empathy and sympathy."
These are LEARNED attributes, not instinctive traits. Watch a child with a magnifying glass and an anthill, or a stick and a dead squirrel.
Muslims have been taught, from birth, that non-muslims are ants, non-members of their family and tribe. When we, as thinking human beings, realize that this distasteful task must be performed, and expand the scope to include our local enemies, there will be a convulsion, and world peace...
In America it’s government school teachers radicalizing kids with lies, bias and hate.