Ford pardoned Nixon but Nixon had already been charged with a crime.
As far as I can remember, one has to be at the very least charged with a crime before one can be pardoned.
“According to The New York Post, Ford’s 1974 pardon of Nixon was “for any crimes Nixon might have committed against the U.S. while he was president.” ... Nixon had not been formally charged with any crime when Ford pardoned him, and the pardon was criticized at the time.Nov 9, 2016”
Nixon also showed enough guilt/remorse/honor to resign (over far less than Hillary’s crimes). Hillary didn’t; she only is out because the voters rejected her.
No remorse, no pardon.