Ground fighting against multiple attackers
One of the most common arguments traditional and RBSD guys seem to have against training in a grappling style for self defence is that you, supposedly, don't ever want to go to the ground when fighting multiple attackers, as it limits your modility and is liable to get you stomped.
Now, even if we ignore the obvious flaw of this argument, the fact that against multiple attackers you're probably going on the ground anyways and not knowing what to do once there is suicide, there's another problem with it. Sometimes, at least, it is GODD to go to the ground when you're being stomped.
Here's an experience of mine on the matter. The last time I was involved in a multiple attacker situation, I got my ass beat bad. I may have told people about the incident before, I don't remember, but in any case, I wound up with a cracked rib and the side of my face bloodied up pretty bad. I was not trained in any sort of grappling back then.
Here's what happened: I got swarmed, attempted to throw some punches, even hit a couple of them, and then got tossed on the ground and surrounded by people trying to kick and stomp me. Now, I can safely say that no ammount of training in a striking art that I can reasonably imagine (short of Jet Li'esque magic) would have changed the outcome of that "fight". There simply wasn't a way for me to beat all of them, and I could not run away because I was with my girlfriend at the time who was wearing high heels and couldn't run very fast.
The only thing that SAVED me in that situation is that I isnstinctively grabbed one of the guys and dragged him down with me. I wound up rolling around with him, me holding on for dear life, and the rest of the people unable to kick or stomp me effectively because they were hitting their friend half the time.
I think this is the only thing that helped me survive relatively unhurt untill a few minutes later the police came and they all bolted. Had I not went ot the ground and used one of the attackers as a human shield, I would have been hurt severely - at least on of the people doing the kicking and stomping was wearing steel toes. That's where I got my rib cracked, I think.
Sometimes going to the ground with an opponent and getting stomped is much much better than going to the ground by yourself and getting stomped. Either way, going to the ground and getting stomped was, in that case, unavoidable. All my training later, I think that the best I could hope for would be the same outcome.