I care about property rights. I won't support a system that doesn't allow people to keep the fruits of their labor
So you don't support capitalism, I take it? After all, it's a fact that the overwhelming majority of workers are not allowed to keep the fruits of their labor. They are expected to accept a tiny fraction of the profits generated by that labor, or fuck off and starve.
It's up to the individual to decide whether he wants to forfeit his property rights
Reality check, it's up to whomever commands the monopoly on coercive force and violence. In this case, the nation state.
You have no rights, you have privileges granted to you by your masters. These can be revoked at any time. If you don't believe me, google internment camps WW2.
I support capitalism, but it seems you don't. It seems to me you're conflating voluntary employment with forced employment. If you want to keep the fruits of your entire labor, go into business for yourself. What you do by agreeing to take a job is sell your labor to someone who pays you for it, so you have already entered an agreement not to own the product of your labor. Ostensibly, whoever is paying you for it can make more off your labor than you could if you were to try to sell whatever it is you were making yourself. That's how you both benefit from an employment arrangement. There's nothing forced about that, and these voluntary employment arrangements have nothing to do with the state's monopoly on force.