If you see him, no you didn't. Meaning don't snitch, like the NYC pedestrians protecting Spiderman's identity in Spiderman 2 when his mask gets torn apart. "Carefully, he's a hero"
It's likely just the power of suggestion combined with confirmation bias : you see a dude with a jacket and a hood on surveillance camera footage, given the context you assume it's the same guy. But looking at it more closely, they differ in many ways. That theory doesn't have a leg to stand on