NHL coaches have a specific job to do. And when they don't do it, they end up on the hot seat.
Win games and the general manager and fans will leave you alone. You can be a total Looney Toon and practice shamanism in the locker room before games and no one will care as long as the slashes are going in the win column.
Make a habit of losing—or even worse, lose the room altogether—and the hot seat only gets warmer.
Some coaches garner attention for doing so much with so little, such as Paul MacLean of the Ottawa Senators. Others garner attention for running teams that are failing to meet expectations.
All four of these coaches are in charge of teams that should be in the playoffs. If they don't end up there, the ax could fall.