“Nice young men can turn into monsters when it comes to giving a get. For no reason at all they can become very vicious when it comes to giving a get.”
I’m not per se going to argue the concept of a pre- nup in the frum community, but your statement above is very off. These “nice young men” were never nice and it isn’t “for no reason”.
People turn vicious for one of two reasons -either they were spoiled as children and really have bad middos, but the girl and her family didn’t see through the fascade before the marriage. Or
the hubby was abused by his spouse and becoming vicious is his (abnormal) way of revenge!