The school's purpose is still education...

It's just not educating in the specific areas you want. I imagine your kids aren't learning quantum physics or fine dining etiquette either. That doesn't mean that the school is no longer educating.

"It's just not educating in the specific areas you want."

You are right. I do not want my children to learn whatever is being taught when the school's IT department is threatening children with the police for trying to learn to make a web page and fiddle with CSS and Javascript.

That is a separate issue, and one I wholeheartedly agree with. If that is what the IT department or administration said, I would also be upset. Saying that it is locked down for XYZ is one thing, adding in a line which threatens kids with police action for wanting to learn something is obviously out of bounds and inappropriate.

However, that is different than claiming that schools purpose is no longer education. It's conflating an entire system with the disappointing actions of a few people working within a school.