I don't see those things as equivalent at all. The penalty for betting on games has been a permanent ban since the Black Sox scandal. People using steroids to try to be in peak physical shape so they can win baseball games is very different than people throwing games to make money for gamblers. The penalty for steroids for the first few seasons was nothing at all. It's cheating, but similar to doctoring a baseball, corking a bat or stealing signs. Even now the penalty is a half year suspension for the first offense. If you want to "suspend" Bonds or Clemens for a couple seasons that's fine with me but they were Hall of Fame players long before they took steroids.
As for Rose in particular, even if they lifted the ban I'm pretty sure the Era Committee would keep him out. The other Hall of Famers don't want him around ruining induction weekend. He's a pretty awful human being.