Oh! Have I touched on truth? Have I edged near a wound still raw and bloody? I thought you had nothing to fear from me, Captain America. But fear creeps in the same cracks doubt does. The paint on your facade is old, now, and it peels before my very eyes. All you have is playacting and decoration on a truth as old as time - that men desire power, and will use witless pawns to achieve it.
Your friend has learned better than that, but you have so much further to go! Don't dare hold him back in that pursuit. Let him go. He knows the world better than you can ever imagine to. That lack of faith is his greatest asset.