Does it matter?

Does it matter?

I see this discussion over and over and over.

People ask (and I was one of those people): Should I stay with them even though they abuse me when their abuse is caused by their addiction?

Or: Should I have left? They were only abusing me because they were struggling with addiction.

Does it, when you get right down to it, actually matter what fuelled the abuse? Does it really? Is it "less abusive" because it was fuelled by addiction?