Letters of Marque

I'm sure there has to be a way to make use of the idea of Letters of Marque in the "War on Terror". Identify the assets of the enemy and allow them to be seized or destroyed by private citizens. There are doubtless all sorts of complications which might make it difficult to keep things from getting out of hand, but I don't see any reason why particular entitities shouldn't be subjected to the predations of the anonymous US citizen. Allow and encourage hackers to crack Islamic fundamentalist bank accounts without penalty etc.