Maybe the human gnome wasn’t designed for space travel. Just a thought.
Perhaps just us were designed to inhabit this very limited biosphere in this tiny address of the Universe.?
Nature is hazardous to the life of man.
Hot climate in summer.
Cold climate in winter.
Viruses
Bacteria
We’ve got a handle on the non-human predators thing but people are still mauled by animals.
In space add more radiation to the mix.