Why does Pete Rose get a "not ever" anyway? He gambled on sports, big deal. Until evidence can be shown that he did something to tank his team and link it to a bet (like the NBA referee scandal) I don't see the issue. And yes, if he did something to throw games, I agree he should be banned like the 1919 White Sox.
Bonds and Clemens...man I'm torn in a way. Both went up on perjury trials and both were acquitted. Both times it was "did you knowingly take steroids" and supposedly they didn't lie when they said no. They were able to convince at least some folks that they didn't know. Sure, other circumstancial evidence implicates that they took something. Still, they're a part of history and history should be documented in the museum.
And if Ken Burns is to be believed
there's already at least one PED user in the HoF. If he didn't think it was true, it would have made sense to leave it out of the 10th Inning. Since it's in there, then at least he believes it.