I remember in my younger days, during a political discussion someone said to me that factionalism was being injected into the bloodstream (of the organisation I was in) and once in it would be very difficult to get out. It proved to be true and it ravaged said organisation.
I see very similar with Everton and the sacking of managers. It amazes me now that people can't see, sacking a manager within 3 months of arriving was a mistake from Moshiri. He has spent an enormous amount of money (not least on hiring and firing managers) to broadly end up in a similar position to where we were when Martinez left.
The players now know, if you underperform for a bit, the manager will go. That was not the case before Moshiri arrived. For all the faults of both Moyes and Martinez, up until that point both managers had (a far greater) command of the dressing room.
At some point the nonsense needs to stop. Managers performances go up and down through a season. Especially managers of teams, who have scored around the 50 point mark 3 in the last 4 seasons (and the 4th only because of a freak season from Lukaku where he nearly got the golden boot).
At some point the message has to be made clear to the squad, the manager will manage and if they don't perform they will be moved on.