John is slightly different but equally destructive; this is because he wants to not deal with the feelings of the children because he doesn't think children have anything to feel strongly about. Lizzie is too young to feel devastated because he makes a hatefully cruel comment about her appearance and too naive and uncaring to realize that stacked up to a problem a twelve year old child can't do a bloody thing about, problem hair and feeling like an outcast is silly. Mike needs his attitude adjusted because he has nothing to rebel against because John is perfect and, CHEE!!!!, when did we end up raising Princess April, eh? He'd find it nifty camping out in the rec room and want to help out Mike and Deanna so this feeling as if no one cares is just drama because kids love to complain about nothing.
The end result of having Elly assume that children only feel pain or confusion to keep her down and John believe that the horrible lives of his unhappy children are a nonstop romp is, of course, to help make Mike, Liz and April into antisocial monsters who ignore the effect their actions have on them and assume that a plea to remorse is being unreasonable. After all, no one cared about their feelings as children and they're great!