I've been burgled before. They dressed up in white "painters" overalls, carried some tools and no one asked anything. Broad daylight, broke the door.
[1] http://homesecurity.lifetips.com/faq/139392/0/do-burglaries-...
[2] http://www.apartmentwiz.com/houston_apartments_information/w...
We once cut the lock on a friend's very nice bike (she lost the key) using an angle grinder and a miniature generator, in the middle of the high street in the middle of the afternoon, and nobody batted an eyelid. We were dressed in normal clothes. TBF we probably got away with that because it was so blatant. Still, it's amazing what people will ignore. Bystander effect and all that.
What should have they done?
Call the police? What would the police do? Question you? Ask about your identities? How would they identify your friend as the owner of the bike?
I suppose that's my point really: most of "security" is just the social contract in action. The reason you don't get robbed is because nobody wants to rob you.
That might actually be useful if the record your ID and later connect it with a bike getting reported as stolen at that location.
Two of them said they owned the bike and gave some plausible explanation and way to back it up, and were prepared for me to check. They both thanked me for asking.
The third one told me to fuck off, and ran away.
Certainly the first two could have been thieves, I'll never know.
Yes! And then you can write a blog post about living in a police state and getting interrogated for going about your business.
There's also this one. First, a white guy. Then, a black guy. Finally, a woman: https://www.youtube.com/watch?v=ge7i60GuNRg