>If they can keep up good grades and goof off in class watching minecraft videos, then so be it.

There is one thing probably that you are missing that the kids at this age should learn to respect and honour boundaries. They should known what is acceptable -vs- not. Just because you are in digital screen, does not mean you can do whatever. How would have teacher taken it if the kids watch a video during a live lecture.

Sometimes, talking with kids is one thing and having them to behave correctly is different. There are also cultural issues in place :-)