It's a known bug
It is? Now I feel dumb, ha. I never saw it mentioned. I knew about the caravan guards, from our mtn home and attacking them being bad, but not these bugged out Friendly Traders. They were NOT part of any trade caravan. They just showed up with migrats. These two here, were like the 7th or 8th I've seen in this particular game. Others died as a result of sieges. I was impatient to get the migrants because they were just not moving. They were plugging up things. Now I have a mess on my hands. Loyalty Cascade, you say. Thanks. I'm thinking of deleting this fortress, 7yr old fortress, but I'm not sure.
Game bugs suck so bad. So much time I put into this fortress, bleh! *spit*
Update: I just abandoned it. Makes me puke, seeing my own soldiers in their newly designed Riot gear uniforms, killing each other as a result of a bug and not being able to do anything about it. Some mayhem, and fights are fun to watch. Even losing is fun. But I don't care to waste one second watching a bugged out loyalty cascade, that was completely avoidable. Hell the villains now don't show as unfriendlies, they still show as dorfs in my fortress. Dorfs killing dorfs. Boo. I'll try re-embark in this region, sometime next month. I dunno, I'll figure something out.
Going back to playing
Tribes Ascend for a bit, til Fortress mode gets some patches. Be gone for a bit. Knutor