You're skirting the issue. Is our country executing "unrighteous authority"? You would have liked the German Lutherans to have rosed up against Hitler; why not the Christians rising up against abortion? And I don't mean in a "voting" sort of way.
Ehud wasn't committing murder; he was executing God's just wrath on a wicked imposter-king. Big Diff.
Ehud assassinated the king. He didn't go out to meet him in a fair fight. He was, in fact, executing God's wrath but that doesn't change the fact that he committed murder.
When our Christian boys gun down Al Queda, are you saying they're committing murder?
Let's keep this in perspective. You're the one who says we should question authority. I'm the one who is saying authority is derived from God and questioning that authority is, in fact, questioning God's purpose. From my perspective, if someone is following a lawful order such as our military men with Al Queda, then it is God who is simply executing His justice through our men. From your perspective they should question those orders.
How about a much more grayer area; the waterboarding of Al Queda prisoners for information? While I would not condone this action, should our soldiers have followed those orders? Do you believe they should be tried? From my perspective I would say that, if a crime was committed, the people who gave the orders should be prosecuted; not the soldiers who carried it out. From your perspective, the soldiers who carried it out should have rebelled against their leaders and they should be held accountable. They committed the large offense while their leaders only gave the orders. You simply have turned the whole authority matter on its head.