While they likely don't have one, if they believe they do and it gives them confidence... that's OK.
I know I don't have an edge and will likely never have one. No worries.
Self-delusion is good ?
I think you're smart, because the market is what it is, and I think it's dangerous to indulge in the illusion that we have any control when we are trading it. All we can do is manage our risk.