What I am saying is that since mentally competent adults also believe these lies, you mustn't use that belief as evidence one way or another. Doing so is basic

What I am saying is that since mentally competent adults also believe these lies, you mustn't use that belief as evidence one way or another. Doing so is basically falling victim to confirmation bias. I suggest you try to base your decision on other evidence (such as the ability to handle money you mentioned) only.