People Listening to Music in Cars

What’s up with people wanting to listen to music so loudly in their cars? I mean, I saw some guy in a convertible with the roof down listening to Johnny Cash really loudly. You would think that someone with such bad taste in music wouldn’t want people to know. I love to listen to music but I don’t feel the need for everyone around me to hear what I’m listening to as well. Plus I also think it’s important to be able to listen out for ambulance and police sirens.