Do you even see the GAP in the skills/abilities/experience between the MC and these characters?????????
It's literally the equivalent of Baki Hanma giving a civilian a gun to protect themselves.
If they're really evil, sure. Shi happens. He can easily prevent it. Just like you said, there are evil people out there and they will kill regardless.
If they're good, they finna save people and grow alongside him which in turn save more people.
The good outweighs the bad. Also, Why would he be afraid of them betraying him lmfaooo
The way MC sees it, these "apocalypse" is not even the real apocalypse. The real apocalypse is the Outer Gods invading. For him,These matter SEEMS so insignificant that it's not even worth thinking about BECAUSE Evil or not, in the end, they will still work together if they don't want to die