Bonds was HOF material if he got blown to bits over Iowa on his way to SF in 1993.
Shoeless Joe was a lock if he just ended up stuck in a cornfield in Iowa.
OK, not analogous, but the question is can bad conduct after the HOF is earned disqualify a guy in the minds of a voter. I think the answer is "Yes, it is possible that some voters make their mind up on later conduct."