There wasn't actually one fellow who just up and "started" AIDS. The original strains of HIV come from monkeys in eastern Africa. Human interaction (either the consumption of afflicted animals for food, or most probably a bite from one such animal) caused the first humans to be infected with the virus. Consider that previously this disease did not exist in a form that could infect humans, and the fact that HIV is contagious while not showing any symptoms. How could you possibly blame or hate the first people who passed it on in complete ignorance?
It should be the people who have been educated on the dangers of the disease, but still continue to put other's at risk; hate these people.
And terrymx, Pokemon is just about as Japanese as it gets.