Well... school is pretty constraining...the seven hours a day spent in classes being told what to do...and most of the students have absolutely no interest in school because of it. I think that's why most student who dropout of school decide to dropout...because of lack of interest. (Although in some cases several reasons influence the decision.)
I think being the inflexibility of school makes it hard for students to be interested. Lucky for me, I live in a school district where you can complete high school in three different forms: day school, e-school, and school lessons through correspondence, all three of which I plan to use...
In my state, a student can leave school on their sixteenth birthday with a parent-supervised conference with the principal and a school waiver signed by the parents. Some states allow students to leave school at 14, some make students wait until age 18. Whatever the case may be, when a student is forced into going and has no choice, it is constraining. Students DO need education, but there are many ways educational experiences can happen.
I don't go to school. I'm an independent learner...meaning, I decide what I learn, when, and how I learn it...and this is perfectly legal. The school district officials don't want parents or students knowing this, though. According to the U.S. Constitution, a "man is not required to send his child to school of which he is opposed." But, the parent must provide an education for the child.
I will start taking online classes this summer, and I will go back to school in the fall of '07.
The American Educational system leaves a lot to be desired, but with limited funding of education, nothing can be done.