Is Preserving A Marriage For The Sake Of The Children A Bad Idea?

I have heard some women say ” I am still in this marriage because of the children” when they complain about how terrible their husbands are.
Domestic violence is now common in many marriages, and I am not specific to any sex as both are victims of it.

Apart from domestic violence, there are other reasons one may become fed up in a marriage.

Inasmuch as some religious folks will speak against separation in marriage, there is still a point one can draw the line to let go.

My question now is, would you rather remain in a psychologically uncomfortable marriage because of your children or let go irrespective of how it affects the children?