Whilst possible he was a Republican, more likely he was one of the many worried about losing democracy.
....
So to protect democracy, its appropriate to attempt to execute a candidate standing in a democratic election.
Not sure I see how this stops losing democracy.
It seems to be the actions of someone trying to stop democracy.
Living in a democracy means accepting the result of a democratic election whether you like the outcome or not.
Accepting the outcome does not mean agreeing with the views or actions of the winner, but it does mean accepting who won.