So let me understand this...you said you would have killed the guy on the bike if something happened to your dog and wouldn't have cared because your dog was chasing him and he wouldn't stop? That's seriously the dumbest shit I've ever heard. As a fairly avid road rider, when a dog chases me, seemingly harmless or not, I don't stop and I never will even if some asshole owner is yelling at me to. Your anger seems a bit misguided here. Perhaps, knowing that your dog chases people on bikes, put him a long lease so he can't leave the yard.
Oh and btw, if you ever do decide to chase and "knock him off his bike" with your car, that's considered assault with a deadly weapon, have fun getting raped while serving a few years in prison you shit stain.