Well, "character" is one among several explicit criteria. From the Hall's statement of the rules for election: 5. Voting: Voting shall be based upon the player's record, playing ability, integrity, sportsmanship, character, and contributions to the team(s) on which the player played. I applaud that character is permitted to be considered by the voters. But there isn't a separate statement about morals, such as "only those of high morals may be selected," which a phrase like "morals clause" will imply to some readers. And the voters are at liberty to weight these various criteria any way they see fit. If eventually the voters elect Bonds or Clemens, there is no clause in the voting rules saying they shouldn't have.