Think about the designer.
Play around with the idea of famous car guys, and tons of rocket guys, and shipbuilders. Read quotes and books (Wikipedia) on what they said about their machines and craft.
It’s a love affair, right? There is competition (think Edison and Tesla). There’s a desire to do it their way and be an individual within the rules of science. To stretch whats possible.
Shipbuilding is an ego thing. God, how much fun would it be to consider an insane person who can destroy everything.
There stands the engineer, his finger on the button, and the rest of humanity begging him to press it.
To Alpha Centauri, the masses scream from the dirty bubbles of trash and STDs. Far away, they beg, from all the trouble I cause and promise to bring with me.
But he had already decided months ago, fuck them.
Let them eat afterburner, he says, before launching. He, himself, the only soul on humanity’s first generational ship. Fuck you all very much, he thinks outside the atmosphere and off.
Fuck you all very much.
Psychics might be important also. But I would take what experts think is possible and just assume it’s not.