Though I do believe that a preemptive pardon is illegal and would be found so by the courts.
Wasn't for Nixon. History disagrees with you.
I really don't see any reason that would motivate him to do this, take the hit to his legacy and damage the party.
You assert damage to the party, based on the example of Nixon, yet refuse to acknowledge it's "legal" based on the example of Nixon. Pick one. Either Nixon is an example for both or neither. But picking the one you like and ignoring the other just makes you a hypocrite.
As for why, it just makes sense. Billions of taxpayer money has been spent on the conservative conspiracy against the Clintons. Investigated constantly for anything and everything for 20+ years. Move on. As for the damage, it's not like she's president. He wouldn't do it if she were elected, but she won't be. So she'll be of no great importance, and not in the new government. So all the pardon will do is reduce taxpayer expense. Why do you want more taxes? Save taxes, pardon the Clintons. I don't like her. I don't care whether she goes to jail or not. It wouldn't bother me either way. What I hate is the billions of dollars spent trying to persecute the Clintons. Stop wasting my money.
Who had their own privately managed server that they used to conduct all department business other than HC?
Ah yes, the, "who else did it" when if you remove "all" from your qualifications, the answer is "all of them that had email". The others before her with email used personal email for department business. Yes, all of them. They also had the official email, which was used at least once (though in many cases, only by an underling). She's the first who didn't bother with the double email that everyone else had done. But nobody else was investigated for extensive use of personal email for business. Though they *all* did it.
How do you grant a pardon for a crime she's not admitting too and hasn't been convicted of?
The same way Ford did it for Nixon. What, it's OK to do if it's one Republican for another, but somehow evil if it's one Democrat for another?