I'm not sure about the infrastructure in your area (sounds like bike lanes would be equated to communism somehow), but if you really care; call up your city council/local government and lever the power of democracy to create better infrastructure for him (ask him to do the same, if he hasn't already).
Other then that, just let him do his thing. If it's not a big deal to you, why bother? You've warned him about the rednecks, and that's the most you can do. From what I can tell from this rant, he seems to be coping well enough to live on his own and doesn't need parenting; indeed, he probably moved out to get away from his parents in the first place and you're probably just stressing him out.