If you are robbed in any way, your first act should be calling the cops. Your second act should be to review and upgrade your security. If your locks suck -- window, door, garage, bicycle, whatever -- change them. If you live in an apartment building, check with management about their security procedures -- how did the guy get in? If you're leaving attractive goods where a thief will notice them and can easily get to them, then lose that habit. The guy who stole your bike is unlikely to do serious (if any) time for it -- of course he'll "be back", in the sense of being out of prison. So...where will he be, exactly, if you don't press charges? On the streets, out some money...but hey, that's okay, he knows where he can pick up a nice bicycle.