People who can't tell if a headlight is out? If you can't tell if a headlight is out, you really aren't paying attention. Also, if they can't tell, then why are they driving into oncoming traffic with their high beams on?

Some people can't afford a replacement headlight bulb. No friends, some people can't afford cars. Vehicle maintenance is required to own a vehicle.

Lack of enforcement. There used to be a time where people would be pulled over for equipment issues, crossing the "fog line" on the right, running yellow lights or rolling through stop signs. Not anymore.