Hi

I wanted to ask, is there a mod against the stupidity of the colonists? I play permadeath, but then, a psychic ship crashes, with 11 Scyther around it. I start bombing it with mortars. There is a plant next to the ship. Stupid colonist incapable of violence thinks: "Oh, a plant next to dangerous vicious killer machines in a hail of bombs. Lets go there, lalala...!"
->Alt+F4

Permadeath, yes, permadeath with self-killing colonists, no thanks!

Is there a mod to change this behaviour, or a mod to change a game into not permadeath? And how to get it for the GoG game?

I can't give you a mod that changes this behaviour, however, you can use the built in zoning options for your pawns to keep them safe from their own stupidity.
I usually create a safe zone, and whenever there is a danger on the map, I zone my pawns, mechs and pets to a safe zone inside my walls - this will stop them going into dangerous situations until I deal with it.
You can get mods from nexusmods, you may also look around there to see what you can find.