Thanks for the correction. Yes, Mike was the biter and Holyfield the victim. Either way, they're both bigger, stronger and tougher than any of us will ever be, yet a simple bite to the ear (not even a vital organ) stopped him in his tracks. Just imagine it was his nose. If you hit ANY creature in the nose properly, you will DROP them instantly. With regards to your statement that "BJJ is the most martial (potentially lethal), martial art I have ever experienced" clearly indicates you're new to martial arts and haven't experienced very much. Even the (not so) mighty Gracies will be the first to tell you that their techniques are for sport first, self-defense second and were never intended to be "potentially lethal". While the BJJ self-defense techniques are very effective, they are also heavily modified for street applications where "going to the ground" with your opponent(s) is never advisable. Oh, and BJJ players get caught in full mount all day every day. After all, why do you think they teach techniques for getting out of mount, unless you've been put in it to begin with? There's also a reason why eye gauging is ban in ALL fight sports, save Vale Tudo (I think)? Because it works incredibly well, that's why. You can debate weather it's "noble" or not, but if someone is truly attacking me and/or my loved ones, I could care less. They'll be lucky to be alive after I'm done with them.
Of course, not all BJJ players are of equal skill level either. After all, just because someone plays the violin, doesn't mean they're actually any good at it. There are many people who have been practicing their chosen art for years and years that are just awful. They aren't good now and they never will be, but they have fun all the same. Kind of like the kid in band class with no rhythm. He can't keep a beat to save his life, but he's got heart, which counts for a lot, but to call him a musician would be a lie. Still don't believe me? Just go to your local college, or high school for that matter, and ask to take a roll on the mat with the Captain of the Wrestling team. Feel free to use all the BJJ you want.....if you can
They're not even "martial artists", just a bunch of dumb jocks and yet they can throw must of us around like a rag dolls.
Self-Defense is simple really, just be willing to do WHATEVER it takes to survive. That is all. This generally entails hitting a soft thing with a hard thing. A nose with a fist, a skull with a bat, body with a bullet. You get the idea.
Here are some clips of fellas having a tough time in the mount from the bottom position. Can you say ground and pound? It happens to the best of them. So, if you're taking someone(s) to the ground you better dang sure be good, if not, you will loose badly and often.
Again, with all things being equal, the high ground wins. Planes are better than tanks, cavalry is better than infantry, standing is better than kneeling, mount is better than guard. This is also why virtually all Aikido waza end with uke on the mat and nage in a "superior" (i.e. kneeling or standing) position.
(why teach how to get out of mount if it never happens, right?)
("What happens when you get a customer that thinks he's Charles Bronson?" jump to :42 mark)
Clearly you're new to martial arts and love BJJ, but don't get caught in the trap of thinking one art is inherently superior to another. They all have strengths and weaknesses, even (especially?) BJJ. Besides, it all comes down to the individual practitioner in the end, not the style they choose to use. After all, it's the size of the fight in the dog, not the size of the dog in the fight.