Good you mention cures for polio. The US does both cures for polio and ensuring polio exists and spreads, by virtue of CIA pretending to be agents of vaccination charities, which killed polio eradication efforts in some places.

Point being, the US does a lot of things. Some good, some bad. You don't get to trade the good things for the bad things. There could be progress in art, science and humanities without indiscriminate drone bombings of innocent civilians worldwide.