> If they also happen to be black, they might want to use the race card "OMG You suspect me because I'm black? Racist! How dare You!" etc, but who cares.

I'd say this might be an interesting moment for self-examination. If their primary reaction is outrage then they're probably not a criminal after all. Maybe think again at why you suspected this innocent person of acting shady. Maybe learn from it so you don't make the mistake again.

"who cares" isn't really a very community-minded reaction when you've just accused one of your neighbours of being a criminal.