There is all kinds of evidence by which to conclude that correlation is not causation. What sort of evidence do you need?
Of that I am not disagreeing. But in many cases, causation is proven because of correlation without any other causes being in evidence. So, correlation typically implies causation one way or the other *or* a common cause.
In the case of the mind and brain states, there is no other causal available and active experiments have changes conscious state by changing brain states. That *does* imply causality.