Hajnal:
I finally understand...
I hate my parents because they used violence, threats, ad hominems, and manipulations against me!
And yet I no longer believe in any such thing as morality.
Why? How can this hold?
Because I don't need a moral justification for my feelings. I simply didn't want to be treated that way -- in fact I was strongly averse to it!
That is all the reason I need -- which I find to be extremely validating. And this is the most rational, empirical, logically consistent, simple, and (I think) beautiful view. :)
By your reasoning, your parents were entirely justified in their behavior towards you because they were following their preferences and you were violating theirs.
That doesn't really say anything about whether you get to be angry or not, but it doesn't make them any more or less wrong than you. If this does validate your anger, it also validates their anger and that they inflicted it on you.
And, of course, that's entirely OK because you don't believe in morality.
Unless, of course, there's a hidden principle involved here which is that it is wrong to violate other people's preferences in which case... oooooooooooooops 