I'm a bit out of the loop on these sorts of discussions so apologies if this is retreading old ground, but... let's asssume I want to engage in some form of pop

I'm a bit out of the loop on these sorts of discussions so apologies if this is retreading old ground, but... let's asssume I want to engage in some form of population monitoring or profiling. Based purely on available facts, what actually is the best indicator of propensity to commit terror attacks? Is it being Muslim, spending time on Islamist websites, being a marginalized single man, something else, or is there in fact no pattern distinguishable from random noise? Surely this must have been studied extensively?