Are cops and politicians really parasites? After all, they do "give back" in exchange for what they take. That makes some people disagree with the assertion that they are parasites.
I can't steal $100 from you, then give you a Twinkie (or a bruise on your head) and call it even. Consent has to be part of the equation. It's the most important part. Without consent, any act is a violation.
The cops and politicians could even give back more than they take, but when there is no consent in the taking, they are a parasite.
It's not OK for me to take your pizza and give you my car, if you don't agree to the trade. Maybe you have no use for a car, and are starving to death. I can't claim you should be happy with the trade, so you should just shut up. Or, I can't without looking like a thug. And this is what cops and politicians do. It is what they are.
Without consent, their taking- even if they imagine they give something up in return- is theft. They are parasites on society, because they are parasites on some individuals. Maybe not on you, but they are parasites feeding on me without my consent, and one person is enough to prove the claim.
Cops and politicians ARE parasites.