In the Quranic moral code, to kill an apostate or an infidel who refuses to submit is a GOOD thing. It is REQUIRED of them.
They would feel shame if they failed to kill.
As I have mentioned...it is the intense and brutal indoctrination of Islam/hate/and glorifying death to their population, from childhood and throughout, which robs them of the mind and heart God intended they should have...therefore impossible for them to “feel” anything close to “normal” emotions for Islam teachings destroy the natural responses they would otherwise have.
What they do is a matter of choosing to “Obey” thier leaders and the Koran..and their brains have been so fried they lack critical thinking skills to do otherwise.