It is not good to wish bad on someone, particularly the mother of your child or children. But often a spouse with a "what about me?...don't I deserve to be happy?" complex will likely never find the happiness to which they perceive themselves to be entitled, especially when that person is willing through their destructive self absorbed actions willing to destroy so many lives, because of "me". Hopefully and most likely the people they have harmed will pick up the pieces and move on with their lives. That person, though they may attempt justify their actions, will have to live with themselves and who they really are inside. History often repeats itself. The best you can do is protect the kids from it as much as possible. That includes not talking the mother/ex down, wishing the best, it is the only mother/father those kids will ever have. It also includes mitigating the damage and providing a better example as a parent. You have to be an active participant in the child's life to do that. To be an active participant you must have access to your children. In order to have access to your children you must fight for your custody rights. Often it is a fight....your lawyer will do it for you. You be the good guy, let the lawyer take care of the dirty work.
Do it for your child. Your child deserves better than your ex will likely ever provide.