So 90% of those responding did not actually read the OP. The tank could not keep agro on all mobs. Since the tank can't do this the tank needs to mark/be taught how to hold hate on all mobs. I've had plenty of bad tanks that I would grab agro on an df just from casting thunder on it and the tank refused to get it back saying, only atk the target they are attacking. And then refuse to mark... the op isn't talking about a tank who holds hate and doesn't mark, they are referring to a tank who can't keep hate and doesn't mark and the Blaims the party