I can tell you two reasons why it's not always the best choice. 1. They're not currently employed which means they would enter into poverty with no exit strate

I can tell you two reasons why it's not always the best choice. 1. They're not currently employed which means they would enter into poverty with no exit strategy for that. 2. They have children which means without relatives on both sides of the relationship willing to help with the transition to separation (and possibly divorce if they're married) it's going to be hard to do this. It also means going into poverty in some cases whether or not the person has a job since caring for the material needs of children is an added burden. And if the spouse was also abusing them that means leaving them in their care isn't an option either. Simply put, it's not easy when it comes to leaving one bad situation. Whether it's an abusive employer or an abusive spouse.