No you understand nothing.
You tell a guy “turn about is fair play” because he doesn’t have the moral fiber to see it on his own. Its a wake up call. That doesn’t mean you do it. It means you remind him the option is on the table. If he’s got more than a dim bulb he says, you are right I don’t want to go there. Issue solved.
Someone who is supposedly “presidential” doesn’t ever make threats about another candidate’s family. That is nasty, gutless, classless, and cowardly.
Period.
End of story...
If that isn’t clear to you, I can’t help you.