I'm sorry for being sorry

'Why did you hit your brother?!'

'I don't know. I'm sorry'

'Why didn't you clean your room before you went out?'

'I don't know. I'm sorry'

'Why didn't you call to let me know you were ok?'

'I don't know. I'm sorry'

'Why couldn't you be the wife I imagined?'

'I don't know. I'm NOT sorry.'

Why, then, am I sorry for everything else?