Huh. I can’t come up with a reason for why molesting baby Hitler feels so much more wrong than killing baby Hitler. You could even make the argument that it’s less wrong.

Is it just because of how killing and death is so normalized in all of modern media?

There is no right answer. It just depends on convention. It’s like color vs colour, neither has been shouted down from the heavens to be the only way to write something, it depends on culture.

I believe they do mean the fact that subtraction is just adding the negative and division is just multiplying by the inverse. You can look up field axioms to see how real arithmetic is really defined. It’s much more convenient to have two operations instead of four.

R wins again! I’m grateful every time i write the vector 1:n

Only in warm climates, definitely not “almost all” cultures.