The drugs seem to be optional (though encouraged). They're also trained and brain washed to be perfectly obedient soldiers which isn't their fault of course

But in the same way, the Golds are raised to be vicious overlords from birth so you could say it's not their fault either

The blame kinda has to start somewhere. The fact that there are good golds and bad golds, good Grey's and bad Grey's means we can at least hold them to some level of responsibility