However misguided this is, I seriously doubt that the police did this with malicious intent. I also doubt that we have all the facts. The police in the UK don't go around arresting people who say silly things about bombs, it's a waste of resources.

C# is not a windows only language at all. Mono is a pretty complete implementation of the .NET Framework on Linux (with some good progress on OS X). A lot of really cool apps, such as Beagle, Banshee, F-Spot, Tomboy, and Gnome-Do, are written for Mono.

There's nothing wrong with the government using whatever technology they has at their disposal to search computers they have legally seized. That they haven't been using such technology up to now is baffling.

If one reads the actual article, it's not about overall happiness/enjoyment but happiness and enjoyment when doing math. This has really little to do with the overall happiness of the society, though it could be used, along with other more general studies, for that purpose.