How come some people blame rock and metal music for everything?

Some researchers have found that test subjects who were angry to begin with become happier, calmer and more relaxed after listening to heavy metal when it is their preferred musical genre. Some people may prefer heavy metal music because they are depressed or even use it to treat their depression in certain cases, rather than becoming depressed as a result of listening to it. College students whose musical preferences are alternative, rock or heavy metal actually obtain higher IQ test scores on average, particularly on questions where abstraction is required.