Yeah, uh, I only said Hoskins was wrong about who Walker is. I didn't mean that I thought the serum could affect a good man negatively. Hoskins was wrong about Walker being a good man....and thus the serum amplified John Walker's propensities, and led to his death, because the dude couldn't stand to be inadequate. And while this is Hoskins flaw, it's an understandable flaw - he's known John since high school, played football with him, been through the shit with him in Afghanistan.
But I see this spawned a 2 page debate anyways for some reason.
It's also clear from that same conversation that Walker/Hoskins probably did some heinous shit to earn those Medals of Honor, and Walker is clearly guilty about it, so Hoskins misjudged that too.