It's not wrong to protect your children, but don't use them to "control" what he does, as in expecting him to care if he hurts them by exposing them to OW. Because he DOESN'T care at this point. That's what OP is trying to get across to you.
...or, you can listen to HB.
Me: 44, Wife: 39 M: 17 years T: 20 years Bomb on 08/25/09 1/13/10: MC started 1/28/10, 2/8/10: More bombs 8/28/10: Wife moved out No talk of D, no movement