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They can wrestle out an amazing amount of information from those grainy tapes sometimes. When our Foregin Minister was stabbed to death in a posh apartment store the perp was caught on a few shoddy cameras. He was wearing a baseball cap and a baggy sweatshirt, so at first it looked like a dead end. But they could pick out his movement patterns and body proportions and compare with the suspects. It was one piece of a flawless evidence against him.
Granted, you won't do this for every shoplifter, but just because you can't identify someone at a glance doesn't mean it's useless.
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