You can leave your job, sure. And then default on your mortgage. Or be unable to pay your rent. And not be able to buy food. (or, if you mean "leave America," then you can move somewhere else... and you _still_ have to either work for yourself, or for someone else.)
There's an illusion of choice, but choosing to work between McDonalds and Burger King isn't really a choice.
Freedom is not the same as having no responsibilities. Slavery is not the same as having responsibilities. Environmental constraints are not the same as having no choices. Consequences for one's choices are not the same as oppression.
You're always working for someone else; that's why they pay you. The difference between employment and entrepreneurship is whether you're working for one person or for many people.
That's the human condition. You can sit on your ass instead of hunting or gathering, but then you'd go hungry and be shunned by your tribe. You can sit on your ass instead of working your fields, but then your crops won't grow and you'll go hungry. You can sit on your ass instead of going to work at the mill every day, and then you won't be able to afford any food and you'll go hungry.
I'm grateful we can sit in meetings and type code into computers in air-conditioned offices for our supper. Of course, building a business and having supper for life would be fantastic.
See my response to rfrey above; I'm not saying that people shouldn't work, just that keeping all of your economic output is preferable to giving some of it to someone else.