Which is fine, and harmless, but yaz, for example, is referring to reactions like this one,Which is pretty much what the OP did.
"I think I'd ask for his business card and take a picture of him and tell him I'm sure the police will have a few questions"
Really ?
And I know that the homeowner is 100% within their rights to do this, but how do you think people who think like this would react if you were taking pictures of their wife and small kids while they played at a park ? I'll bet they'd "overreact" in that situation.