They sent people up in a tin can with the bare minimum computational power to manage navigation and control sequencing. It was barely safer than taking a barrel over Niagara Falls. We do have much more capable and reliable technology.

Buzz Aldrin (?) was quoted as recalling holding a pencil inside the capsule as they were out in space and thinking "that wall isn't very thick or strong, I could probably jam a pencil through it pretty easily..."

Death being a layer of aluminum away changes your mind.