I agree to an extent. I don't work for minimum wage, but I know people who do... or would if they could even find work.
The problem is that (even if it's a small percentage of people) there are uneducated, disabled, etc... people out there that need to be able to support themselves. Just because they are less fortunate, doesn't mean they should have no chance at ever bettering themselves.
Let's assume that someone is raised in a broken home, doesn't finish high school, and is forced to raise themselves. They are basically doomed to work at a minimum wage job unless they can somehow work their way up (by doing a good job, furthering their skills/education, etc...) The only problem is that this person is making just enough money to scrape by... leaving them with little to nothing to go back to school or save up...
I agree that if you work hard and really want to succeed, that you can, but even with perseverance, it's incredibly difficult to work your way up from minimum wage