I think arseholes are distributed evenly too.
If 5% of all people are arseholes, everywhere, then a country with 50 million people has 2.5 million arseholes. But a country with 1,428,000,000 people has over 71 million arseholes. This is why they seem to be over represented by the large nations.
You are right that we are more likely to notice them if they travel near us or communicate in a language we understand. This is why Estonians are more likely to think badly of Finns whereas South Africans are more likely to think badly of Nigerians.
He wasn’t a combatant and he hadn’t killed anyone. He was an innocent bystander and even the IDF admit it.
Not sure why you put so much energy into making up a fake scenario.