No you won’t have empathy towards your enemies when you don’t have the luxury to do so.
How many conflicts are going on right now where religion and local society is killing ‘others’ without any mercy?
Do you think those brain washed massses can waste to feel emphatic towards the enemy that is ‘evil’, ‘bad’ or ‘unclean’ and deserved to be killed?
If they would - they freaking would stop all these friggin wars. Morality wins - and morality still not a good thing.