I feel like that the termination of Jon Snow by Bowen Marsh was appropriate. The Lord Commander served for life so the only way to remove a crazy leader like Jon from power is to kill him. That is their way of firing an unfit, incompetent, treasonous commander. It's been said before but I will repeat it here.
Ramsay Bolton gave Jon the Pink Letter. Bowen Marsh gave Jon the Pink Slip.
Jon was already a known deserter.
He started making foolish decisions near the end. T