If you don't know you're being abusive, you wont think you are doing anything wrong will you.
You might not know because you were raised with abuse and for you, that is normal family behaviour so even though you're continuing the cycle of abuse, that is normal and therefore must be right.
Abusers justify their abusive behaviour by blaming the victim; s/he asked for it, wouldn't stop doing something or other, wouldn't start doing something or other, wouldn't speak, wouldn't shut up etc etc.
An abusers self pity is a defence mechanism; I couldn't help it, it's not my fault, I don't understand what I've done wrong etc etc.
If a personality disorder is involved for example narcissism, the abuser simply doesn't care. Right or wrong only comes into the equation if it's right or wrong, good or bad for them. They have no empathy for anyone else and the only empathy they're interested in is for themselves.
They don't care about their victim(s). The only victim they'll see is themselves.