"What can you do?"
You can do anything you wish, so long as you're willing to accept responsibility for your actions and whatever the consequences might be for such actions.
"What do you do?"
You obey the law. Murder is not civil disobedience.
Of course, Reoder was neither 16, nor was any child of his - born or unborn - in any jeopardy, to say nothing of immediate jeopardy or danger. Tiller murdered a man in cold blood because he didn't agree with a Supreme Court decision. That's not admirable, that's anarchy.
“Tiller murdered ...”
Freudian slip?