Disgusting: Iran's Capture of a High-Tech Drone

I am so disgusted with Obama.  One of our high-tech, stealth drones was somehow captured by Iran, apparently in one piece and good working order.  Obama could have either sent in commandos to retrieve the drone, or could have had them destroy it to keep it out of enemy hands.  But he did nothing.

Iran is expected to sell the drone to Russia or China so they can reverse engineer the drone and one of our strategic advantages will be lost to our potential enemies.

What I want to know is this:  why aren't such devices equipped with a self-destruct charge that could be triggered remotely?  Then we could destroy captured drones without having to put our commandos in harm's way.