You mean showing a couple seconds of a clip without any sound or context is how these cameras are going to be used?
Imagine a Fox news story about an officer shooting someone, with only a few seconds of a video clip released by the police (the rest of the clip is not privy to the public yet). They could replay the same 3-4 seconds over and over and build speculation.
That's not exactly a far-fetched idea, you can probably come up with plenty more. The authors are clearly trying to emphasize that a few seconds of footage is not enough to make a decision - so you agree with them.