You made him promise not to kill them! I mean, the kidnapping's bad but I robbed a bank one time and technically stole my TARDIS so it's a bit pot kettle black if I judge you too hard on the kidnapping. But not killing? That's good! And, based on what I know about your Gotham, a bit harder than expected for a lot of people.

[ why does Gotham have so many homicidal super villains: the world may never know. ]