"It's hard to fight an enemy who has outposts in your head" (Sally Kempton). In an abusive family, your head becomes infested with their outposts. It's almost impossible to destroy the outposts in your head while you still have contact with them. Therefore, it makes sense to cut all contact in order to clear the infestation. When you make contact again, your head will become infested again, but to a lesser degree. So, cut and clear head, rinse and repeat until you can have contact and keep your mind clean and clear and safe. But it is not easy.