I have made the same experience: police don't really care. Do report the incident though:
1. Maybe the thief will be caught by police for something else, then he can also be charged with stealing your bike. Justice served feels good and he will need to compensate you.
2. If you have a household appliance insurance, your bike may be covered and a police record is neccesary to claim the money.
Also, you might want to consider involving the university as they keep photos of all students on file. Why not put up a "wanted" poster with a cash reward of 7,000 NT$ ? Someone might hold a grudge against the thief and rat him out.
Don't bother with any third parties (students, colleagues) complaining about the thief's human rights. Only the thief could actually make you take the photos down - I doubt he will demand that though