No. It has nothing to do with the Constitutional right to face your accuser. Or a right to a trial.
In this country, we don't kill on an accusation.
You were the one that brought up the subject of the Constitution. In this country murderers are let out of jail every day. Are you going to say you see nothing wrong with that practice? How would you feel if a lawyer got a murderer off and that person killed a member of YOUR family. That happens far too many times in this Country.
I watched the show “Ironside” (1967-1975). Raymond Burr played a lawyer that would only take cases where he knew the defendant was innocent. I remember one show where he found he was defending a criminal and resigned from that case. What a novelty, an honest lawyer. Yes, I know it was a TV show.
My, how things have changed. ;0(