Earlier quoted context omitted.
Extremely controversial. Stopping prisoners from harassing their victims/witnesses against them/enemies or organising others to do their dirty work externally is already a massive problem. Prisons have the ability to listen to calls and read mail to try and curtail it. Giving them access to the internet makes all of this far easier, and monitoring it far more expensive. Not to mention that now they can use the intern…
It's a lot easier to curtail things like this on the internet. It would be dirt easy to set it up to only allow certain content (let's call it "constructive" content, like Wikipedia, various news sources, etc.), while blocking content with specific keywords. Prisons have a finite amount of traffic, it's not like we're setting up the GFC. It's dirt simple and dirt cheap to set iptables up to handle this with the limit…
And news sites but not the comments sections on those news sites?
It sucks that this is even an issue, I agree. The proposal in https://news.ycombinator.com/item?id=10434720 would be interesting, if workable.