For me it was self preservation. I was drinking at the time myself so my anger was magnified. Drinking or sober, it wasn't a good place to be in. Shortly after my daughter was born is when I started to look for answers on getting myself sober. With me sober, I was better able to see when things were unhealthy and the visits were cut short. My children did not need to see poor behavior and neither my wife or I needed to put up with rude behavior.
Boundries keep me at peace.