You are deeply confused. Descartes said “cogito, ergo sum,” precisely because he DID want to prove that he actually exists. In other words, to prove that life, or his own existence, isn’t all a great delusion. What you’re dismissing as a “waste of time” is precisely what Descartes was seriously worried about.
What I’m pointing out is that his argument is enough for ME to prove TO MYSELF that I exist. It is NOT enough to prove to anyone ELSE that I exist; nor is it enough to prove to ME that anyone ELSE exists. The reason is that I know that I myself think, and can reasonably deduce that I must therefore exist. I do not know that you think; all I know is that I think I hear you claiming it–which isn’t nearly enough to prove that you think, let alone that you exist.
Descartes’ argument is ingenious, but it is not tautological, it is not “a plain and simple fact,” and it does not prove nearly as much as you think it does. It doesn’t prove that the universe is real, nor that anyone other than myself actually exists.
Here, too, you’re deeply confused. That you think something is a fact certainly doesn’t make it one. You are confusing reality itself with assertions about reality. Reality doesn’t “need to be proven,” because it just is. It might be very different than anyone thinks, though–so any assertion about reality must be proven. For example, whether or not God exists is a fact. Whichever happens to be true, IS true, even if everyone in the universe believes differently. But my assertion that God does (or does not) exist does require proof.
Even to begin classifying self-ownership (or any right) as a fact is beyond laughable: a right is an abstraction, which means it exists only in minds. A universe devoid of sentient creatures would also be devoid of rights. To call something that only exists in minds objective truth is really, really effed up.
As I pointed out to your infinite superior, Irenicus, if right and wrong have objective existence, then they can be measured experimentally.
–Len