Maybe they need to check out these guys' character a little better before putting them in the tin can.
I don't mean to belittle all of our Astronaut Heroes, believe me, I am a huge fan, and do to my dad's work I had the great pleasure of getting to know a lot of them when I was younger... but you gatta be half whacked to willing strap yourself to a nuclear bomb and then ride into space and believe you will live through it and then safely land back on Earth.