At least we're in agreement that parasitism is not a desirable outcome. We seem to disagree on what constitutes parasitic behavior.
First of all, I think that the idea of estate tax is lunacy in and of itself but now that we have it, let's think about what you're saying; that it's not okay for an individual upon death to transfer his/her wealth to a person of their choosing (whom they may have mentored to further a legacy they were passionate about) but that it is okay for the proletariat to forcibly acquire said wealth because they know better?
How is that not outright theft? I would like the opportunity to freely determine how my acquired wealth will be spent after I'm dead. If I would like to leave it to a mentee of mine to further some work I had began, then being the acquirer of said wealth, I deserve that right.
You know, this experiment is already done and dusted. Any time you advocate for egalitarianism, look at the results of "The Berlin Wall's great human experiment" then be afraid. What sort of government shoots its own people to prevent them from running away from the horrid conditions they've created? I'll tell you which one, a socialist/communist one.