You can do similar things with a cooler or two and a small room, has the added benefit of not destroying any of the furniture and you can hack up the colonist for some of your meat-eating animals and human leather for rec-room armchairs. Nothing like sitting in a comfy masterwork-chair made out of your ex-wifes and that abrasive pyromaniac non-hauling asses skin.
Human meats a good extra source of income for, as is selling the skin or the skin furniture you make which becomes more plentiful than any animal once raids start to become huge.
Just need to make sure your butcher(s) are sociopaths and chop em up and to put the human body pile in your freezer far from the rest of the room to keep anyone else from stumbling upon the mass and freaking out. Big problem so me if by the time I get all the bodies and loot of massive raids cleaned up a new one has started up. Was funny when the "Seen a dead body" debuff had no limit and anyone who wasn't a sociopath would instantly break down wandering near the entrance of my base seeing the several dozen bodies laying around from one of those raids.
Still what gets me bored about playing that sort of colony is the fact that you're stuck defending, the game really needs the option to let you raid yourself. I'd really love to play the stereotypical band of reclusive nutjobs who make everything out of the victims they collect from raiding and massacring other settlements. Would be real fun sending out teams to breech people's walls with nades and go around collecting people with stunning weapons.
I am sure you just can starve them away. Me, I almost love those shitty colonists, in my last game I have freaking two models who mostly just hang out. And one guy that everyone dislike.
Now that would just be boring, wouldn't it? I usually keep next to worthless colonists around because they still have certain uses, but in some colonies food is rather scarce so feeding prisoners or nigh worthless peons is not an option.
So long as someone can haul they're not worthless (unless they're a pacifist who's afraid of fires). I don't like melee guys that get a debuff using ranged weps, but they're still good as back up medevacing wounded during gunfights or hanging around to ambush anyone trying to go for my snipers.
Even pacifists are good at those jobs or staying back in the base to put out fires while everyone else out fighting.
I doubt there are cities out there. Mostly tribes and slightly more organized tribers with modern weapons.
Each different group has their own settlement they come from. So you'd have tribal settlements that are very basic, friendly visiting colony ones that would be comparable to what the PCs base typically is, and finally the raiders who'd be more well defended but have less farms and other shit laying around.
If they do add in PC raiding I'd like to see tons more different kinds of settlements, like more cave base focus' colonists, ones full of scientists with more advanced stuff to take (or barter for), or larger scale cities that are planetary hubs supporting/supported by numerous other tiny villages.