You didn't found a trader, just a POI that looks like a trader at first. But when you open the front gate a bunch of Z's jump at your.so uh. i found a trader base but it was destroyed when i got there. no trader or anything, walls busted in etc. is that part or the game (finding random dead outposts) or something i have to worry about DF? being the trader protection taken away
You don't have to be worried about the traders, even when they got killed, they respawn after awhile, and if you like you can reinforce their structures.