To be honest, the only part I disagree with is the cut off at safe noise levels thing. But to be frank, people know the dangers with loud music. If someone wishes to risk injuring themselves, and pay money for the priveledge, then I say let them go and enjoy themselves.
What does need to be done, is to implement something (this is active in America, along the Miami Beach). Apparently, if a policeman can hear your radio from X distance, it's either a $xxx fine or you have to go to the judges chambers for 2 hours and listen to classical music. Nothing else, just yourself in a chair, and the stereo. That would work and be far more effective than putting a noise limit in concert. Then people would just hook up a microphone to a Max-Power car and have a portable concert..