Wrong on two counts:
First, it is a right – it is just not a Federal right. It is one of those things left up to the states by the 10th Amendment. The Constitutions of the various states, however typically define education as a right. For example, Article 14, Section 1 of the Constitution of Arkansas:
I bet if you look into your state constitution, it says something similar.
Second, you can accuse people of “not taking advantage” of the system only if they have equal access to quality schools. Go to your state’s No Child Left Behind Report Card on the internet and note the wide disparity in performance from school to school. Plot the low performing schools on a map and tell me where they are – in the most crime- and poverty-ridden districts.