This idea is about helping friendly factions. If you are friendly enough with a faction, there could be an event where they ask you to help them with raiders. You can choose to accept or decline it. If you accept it, you will be taken to another part of your planet with colonists you select to go and try to kill the attackers. If you decline, you will lose a small amount of relation points.
If you accept it and then kill all the raiders, the faction will reward you with something that depends on how difficult it was. If your colonists die, you will lose them forever, that is why it's important to choose your colonists wisely and not choose them all. You can also run away if you think there are too much raiders. If you run away you will lose more relation points then declining because the faction thinks you're a coward
Sorry for bad English.
I do not know if this is a good thing because is hard to get colonists and raiders raid whit a LOT of people.I think if they would nerf the number then is gona be ok.
P.S. There is a topic about raiding sombody.Just saying.