For one thing, I don't see parental rights as an end in itself -- it's a means to the end of the best compromise in formulating real-life rules we can use to maximize the well being of all.

Then do not misrepresent yourself. Do not say you are arguing for parental rights, because you aren't. Say what you are really doing: using parents for your own benefit.

Thanks.

For instance:

Next, the right answer for many decisions is not symmetric. The default position is to not do an activity. For instance, either a child or a parent can veto skydiving. Both must agree for it to go forward.

This is misrepresentation. You would never agree to a child vetoing toothbrushing, dietary choices, or bedtimes.