I don't disagree with what you're said but I'm not saying that they have the same age or that the ultimate origin doesn't go back further.
The point is that nothing brings home reality of the top bleeding the bottom dry, in all its forms, better than an undying blood sucking parasite, that gains extra life from your dead labour (excess to what you need for a reasonable life etc.). What you're forced to do, but not for the community or pensions, hospitals. Just to make someone else richer, for doing no work.