"I think we should arm only the pilots." The fewer the people that have the capacity to bring down the plane, the better. If a pilot has a gun, so what? He's already capable of destroying the plane."
Maybe..........but you just cut the odds, significantly, of onboard weaponry being a deterrent. If you're a nutcase terrorist and know that the ONLY weapon(s) is/are up front, you have a HUGE edge.
"We also need locked cabins for the pilots."
Already have 'em; have had 'em for years. Piece of cake to get through.........believe me.