They, technically,already are, because they need to do community service in order to pass high-school. But, if you're asking if they should do community service, or more of it, than yes. There is a lot of greed in the world and a lot of people could use some help. They don't really have to help people, they can help animals, or if they go to church, then they can help their church. It is a natural human behavior to want to help, and society has ruined a lot of that. So, yes young Americans should be doing community service, so it can better the world and themselves.
Hope this helps.