When I was in high school kids didn't go anywhere for spring break. Nowadays some high school kids whose parents can afford to send them on a trip out of state do go on spring break trips to sunny locations, but I can't say how many of them experience the wild out of control stuff one might see in the media. I would guess proportionally not so many.
Some college kids do go to spring break locales, but again, when I was in college in the Midwest 20 years ago, none of my friends did that. That cost money, which most of us didn't have to spend on such things. We all went home to our parents, occasionally on a work trip with a church group, or worked to save money for tuition. Of course, there are plenty of students who do go south and get wild, but I would guess that as a percentage of all college students in the U.S., it's a relatively small number. Of course, if you take 100 from college A, 50 from college B, 75 from university C, 25 from college D, 50 from university E, it adds up pretty quickly. There are a lot of colleges and universities and most probably have spring break within a three week period.
I know students at my current university for whom $15 is a lot of money to spend on entertainment. They aren't going to spring break in Florida or Mexico.