School presents students with artificial rules and an environment that simply doesn't reflect the real world. They call it academic integrity but it's really just artificial difficulty. In the real world, people work together as a team, they build on top of each other's work, they have free access to reference material... The real world is pretty much the opposite of a school exam or assignment.

In school, people have to prove themselves by doing stuff without any support whatsoever, only to be punished for any and all mistakes. All grades are final: there is no opportunity to review one's mistakes, learn from them and get re-evaluated. Either get it right the first time or risk failing the course. Of course people cheat: the cost of failure is simply too high. Outside school, people use every trick in the book to lower cost and risk; somehow that's not acceptable in school.