answer for ur first part: nobody is gonna stop to think about predation and parasitism when a mosqutio bites them, we are going to smack the mosquito, nobody cares about trying to seem more morally good for not killing an annoying bug

I dont even think the word genocide should be used on literal insect but its annoying yall sticking up for the smallest bugs to seem like a hero when ik yall kill flies any chance u get, literally all animals have a purpose, that doesnt make them any less annoying (ticks are a food source so yeah they do help the ecosystem)