The Uninformed Cyclist

I live in Tarzana, CA and am running into a disturbing issue with cyclists who do not know the laws about riding on the sidewalk nor even care about them.
Several years ago, I was run down by a speeding cyclist as I stepped out of a drug store in down town Van Nuys, CA. Both of us went sprawling onto the side walk and I felt more concern for this young guy and his bike than myself. Then the next day, my ribs began to HURT real bad (and got much worse later on) at which time I wanted to stomp that moron's bike to pieces and knock his f---king block off! It didn't occur to me to get his name and phone # or anything so we picked ourself up, dusted off and he blithely rode away!
Now, when I try to tell cyclists that it's illegal to be riding on the sidewalk, they treat me like I am a pathetic idiot and either ignore me or tell me off with a attitude of "shut the f---k up, OR ELSE!" I am never going to let another cyclist run me down again and if it ever happens, the cyclist and his bike are going to get hurt way worse than I was back in Van Nuys so I have decided to walk the streets near my home with some dog spray and an 8 inch section of lead pipe in case I am ever assaulted by one of these bike-criminals.
Meanwhile, it puzzles me why so many of these bikers are ignorant of the laws and act like they are utterly free to do whatever they like on a bike. When I was biking (I'm in my late 70s now), I learned about bike laws and rules even if only for my own safety. It's strange that these bike riders don't know nor even care about the safety of others as they blast down the sidewalk past our home. I admit that the street here (Burbank Blvd) is pretty busy while the sidewalks are usually empty but still there's times when the street is empty and the bikers don't need to be riding on the sidewalk. It's even sicker that these pathetic bikers expect us to step aside and off the sidewalk so they can ride on by! As for me, a biker will need to dismount his bike and politely WALK it past me then remount if he must continue on the sidewalk. It's only common sense to avoid hitting a pedestrian or animal with their dangerous vehicle but most of these idiots just don't care about anyone's safety!
My plan is to arm my self with a good defense and stop bugging these thugs about the law which they never even heard of. If the law can't or won't defend us pedestrians from these bullies, I will take the law into my own hands and protect myself the best I can! It's only common sense that I refuse to be a victim of these bike-criminals if my own police can't or won't do something. Someone at another forum mentioned that the city needs to put up posters informing everyone of the bike laws and rules but I've never seen such a thing anywhere! Hey, it's ok that I'm on my own and need to take care of my self. It won't be the first time that I've had to defend my rights and stand up to rotten bullies like these bike violators. I am writing this here in the hopes that some honest and law abiding cyclist might come up with a solution to HELP his fellow (ignorant) bikers do what is right so I don't have to walk around with weapons in my pockets.
If I were still a serious biker, I'd want all other bikers to know and obey the rules just to make life better for me and other bikers.
What do you think about the sidewalk laws and common sense in sidewalk use? I am not totally against riding on a side walk but I am totally against ignorant, offensive and DANGEROUS sidewalk use by cyclists. I am sure there are times when a cyclist has to get off of a busy or dangerous road but aren't they still supposed to ride safely and sensibly on the sidewalk?