I often hear people state, How can anyone do that for a living? Think about no one picking up the trash, think about all the people in service jobs, think about truck drivers, teachers, firemen, police, doctors, all jobs, ect....In my opinion, they are all equally important. Reason being, without one or more, would be like a bicycle tire without all its spokes.
All jobs are important but not equally important. If they were all equally important, everyone would be paid the same. While we do need to have the trash picked up, I think that a heart surgeon's job is more important than a trash collector's.
Think about this, the guy who keeps the sewers moving saves the lives of most of the people who use the sewer. In London there were some very major outbreaks of illnesses like cholera that come from fecal matter, but we don't value them as much as the sports star. And I tell you what, those guys don't ever manage to get the smell off their skin, its one nasty job they do!
There is no way that ALL American jobs are equally important. For example look at the difference between a doctor and an outbound call-center agent. If one of the jobs didnt exist then its likely people will die, whereas if the other didnt exist it would rid of a minor annoyance to most peoples lives.
There are still a lot of very important service jobs that need doing, and its these that are often taken up by foreigners