I'm glad you made it out okay. I have had a few similar experiences while camping. Most of the time it involved the other "campers" using lots of drugs and alcohol. Although I didn't wait until they decided to cause trouble, I packed up and left as soon as I started to feel uneasy. I figure that packing up and moving on to another campground is easier and safer than having to deal with a bunch of hooligans at 2AM. Good thinking on your part but next time I'd say don't take the risk.