@glitterbag,
You're apparently way too reasonable and rational, Ragman.
The things people do to each other! Unbelievably sad.
And who knows what the stepdad went through as a youth. A lot of times, this is cyclical, unending perpetuation of what they grew up with. Not a defence, but perhaps an explanation.
Some people just can't get past their past. Or just don't have what it takes to do so.