If it is a topic which deals with something they themselves are living under than it makes sense. But if it is not, then that makes their input mean less. Makes no difference that this is a international forum. Sure they can comment. But they will be taken less serous if they do not live here if it is a subject like say, the Second Amendment.
On topic. The "trickle down" method is working well here in Ohio. We have job growth and the governor has reduced taxes. We have a surplus in the state funds. Under the former democrat governor, we were 8 billion in the red.