Ergo Cogito Sum is Wrong

I think therefore I am.

The argument:

• I think
• All things that think, exist
• I exist

This argument is garbage in the context Descartes uses it. If an evil daemon is manipulating your thoughts, you indeed cannot be certain of the world as you see it existing. But, you also cannot be certain of the integrity of your thought processes. Just because an argument seems valid to you, does not mean it is actually valid, It could be the case that the daemon is manipulating you to overlook the flaws in certain arguments. It is also possible that the basic logical axioms you use to evaluate arguments are themselves entirely wrong, being fabricated by the daemon and in no way reflecting actual reality.