Earlier quoted context omitted.
How? By investigating a report of a crime, determining it was false, and releasing the guy?
They charged him without any evidence. They were harrassing an activist. It wasn't incompetence. [Edit: the article didn't say they charged him; I was wrong] Well, that's how it looks to me, on the basis of a single report in a tech journal with a sort-of tabloid outlook. Maybe there will be more information in coming days.
The article explicitly says that the police did not charge him.