Ive competed as a professional in MMA, Boxing(amateur level), Tae kwon do and BJJ on a national level as well as being a bouncer in my youth for about 4 years. When someone throws a decent leg kick its best to check it with your knee as its one of the strongest and hardest parts of your leg(checkout Chris Weidman Vs Anderson Silva and many interviews with Weidmans coaches after that event for evidence).

go figure people have really good reflexes for defending their groin/eyes.

In a drunken state nobody has effective defense for anything against a sober, trained opponent. During my bouncer days a drunk 250lb man would feel like a paper bag when I grabbed him. If you are in a sober situation with two grown men the better trained will win every time. Im only a blue belt at BJJ but Ive made men who were twice my weight beg me to call the police.

The only way to destroy a knee joint is downward pressure like from a takedown or if someone is standing parallel to you with all their weight on it. if you are on the ground with a man twice your weight on top of you how do you expect to attack his knee without training on how to do that(kneebar, leg locks etc).

You want to be throwing elbows to the top of the skull, scratching at the face, eyes and neck or pulling at ears if you are strong enough or have long nails to cause damage. If youre trained in BJJ or wrestling you should be able to get a sweep and subdue your opponent until help comes.

They can be used as auxiliaries but should not be your main strategy.

Your main strategy should always be to walk away or run no matter what. Believe me when I say some of my best friends have been jailed for throwing someone into the concrete who has then went into a coma or been hospitalised. One of my best friends growing up is in jail for life because a guy grabbed his girlfriends ass when they were out and he hit him in the temple, he fell against a curb and died.

Additionally I have a lot of experience kicking things.

No you dont. If you did, you wouldnt be making these idiotic statements in a fatlogic thread.