Why is the Baseball Hall of Fame so stingy in putting in players from the '80's and 90's?

I could easily list 20 players who have been robbed of recognition, Tommy John, Bert Byleven, Dave Concepcion, Jim rice, Dale Murphy, Andre Dawson, Bob Boone, thats off the top of my head. Seems like they are penalized because the steroid wonders could come back from injuries and perform at higher levels as well as a shrunken and lowered strike zone where guys golf for hits rather than getting handcuffed by high fast of the past.