Being a wife beater doesn't make the music crap. It is possible to appreciate the music created, whilst despising the wife beating.
What's better Ike, his faults, his music? Or to have stayed away and never made any music?
Tina Turner's level of superstardom is down to a number of factors. Talent and hard work, clearly being a couple. That effort and her history of abuse in a country like America, made her what she is today.