by team A to send a message to the remaining personnel - Certain things will not be tolerated.
The value of the move for that organization is the widespread affect that they HOPE it has on everyone left.
The other team in a deal like that can get a bargain. Because sometimes (not always) the traded player gets the message, too.
If he does, then team B gets both the player value AND the salutary effect of the trade on the traded player.
In the meantime, I have no doubt about Sean McVay's ability to both relate to young players, and to instill and maintain discipline in his team.
He has already set a completely new tone, and a whole team of players have bought into it.
Peters will have an opportunity, but also pressure, from multiple directions, to get with it, straighten up, and fly right.
After that it's up to him.
Ramily!