It's not as effective as arming yourself, but it is something else you can do. Sometimes, if enough people do write our Representatives and Senators, we can cause them to realize they will not be re-elected to their cushy jobs if they piss too many of us off. We don't write them much, so they gauge our sentiment by what we do write them about. If you're like me, nothing is as objectionable as murdering people across the ME and W. Asia, and the USA is by far the biggest source of funding for such vile crimes.

Dear @valued-customer !
Did you say you should write a letter to the Representatives and Senators of the United States Congress?

I don't know about the state and federal legislatures in the US!