bsharg2:
It would be unfair to minimize the multiple forms of tzaar from physical abuse. But i think your comment is unrealistic, and certainly nothing you could suggest to others.
There are other forms of abuse that are intolerable. There may be dynamics to a marriage that help make an abusive marriage, even if physical abuse is absent, unliveable.
There are also times when even a non-abusive marriage is a horrible experience for one or both parties, and these are potentially deadly for the kids. The concept of “staying together for the kids” sounds really nice and kind, but is so often toxic.
As much as we should revere the institution of marriage, and go to extreme lengths to protect it, we must be aware that it is sometimes best terminated – hence a parsha of gittin in the Torah. Reaching the determination that this is the best direction may be a complex issue, but it is not a good idea to suggest that the only way to divorce is if there was physical abuse.