Red by accident? That doesn't sound like accident. When you go to felucca, and kill someone, that's not by accident
Ooops, I accidently kicked your ass.... sawwy... 
Hey, it's easy to go red when you don't intend. One of my favorite UO stories comes from something like that. Back in the days of Yore, I had a red trapped box bomber who was notorious on Napa for mass slaying with his GM tinker boxes. We'd deposit them around the banks at Britain and Magincia (yes, people were there at one time) and watch while we laughed on Roger Wilco as people would open them up, run about a screen and die from poison, or just blow up outright.
Anyhow, I had been recovering from this red madness and just went blue the day we all decided to go down into Deceit to farm liches. Well, we got jumped by a group of reds and some noto-pks and while I was defending one of my friends, I killed one of the notos and went red again. After that, I tore out of there because I didn't want to die and get stat loss.
You start talking about the days of yore, and I know the accidental red.. it was usually my brother doing it. He went red by accident because he forgot his kill count. Or, he accidently attacked one person when 2 others were on the screen, and you know how you can't leave any survivors around.
The bombers, I never fell for that one. Our bank adventures were bank thieves. Our other adventures were, well, let me tell you, he'd delete characters and remake them because of either stat loss or perma red. Or, I'd go red because he accidently ran out of regs and didn't get a kill in yet, so, I'd have to go bale him out. Ahh, I loved the days of yore, where you could be in 80s in skills, and you could whoop someone that's gm, just because you "played" better.