Is an unhealthy relationship ever acceptable?

The reason I ask this is because of conflicting feeling that periodically emerges from within me. The thing is I really miss my dad, yet I know I could never have a healthy relationship with him.

Some background: My dad was absent most of life and would only show up sporadically on birthdays or other random times. Two years ago he came into my life for the longest period I can remember which was about a few months. Long story short I told him I could not have a relationship with him because I could not support the decisions and actions he chooses to make in his life (beating women etc.). Now I miss him and still want to know him, and I am wondering if I made the wrong choice and if I should try to have a relationship with him again.