Why would you assume i haven't?My friend was hit by a red light runner and was hospitalized in a coma. Maybe someday you'll get the pleasure of knowing someone close to you go through that too.
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I have reported drunk and drivers as well but you seem to be going out of your way to report anything you see that is against your "perception of right", only saying this because of how eager you seem to report anyone.
..and in regards to cars with black smoke, it is the police job to deal with those, maybe if they didn't spend so much damn time hiding behind a tree to catch people doing 65 on a 50 they would be out there looking for the "street racers" so that you and your friends could feel safe!