The best advice I can offer when seeking what is true, is to find something that is logically consistent. Any time something arbitrary is introduced into a system, I find myself cringing. If you have a system with arbitrary limits, who gets to decide those limits, and why is their decision worth more than that of someone else who may not agree?
I think that is something to avoid no matter your political beliefs, because something can't be right if it just depends on who you ask.
Disclaimer; I am a voluntarist/ancap.
Mr Khan; the reason that ancaps and some libertarians are against a seat belt law is because a seat belt is designed to protect the person who wears it. A seat belt law takes away the freedom to choose not to wear a seat belt without outside coercion being involved. You're not free to choose if you can't choose poorly.