Will, you're forgetting that often times security cameras capture at significantly less than 30 frames per second. 15 or less is very common. This is to save videotape, which costs money.
There is also the very real possibility that the camera had a shutter going, in which case we might actually be spacing out the visible frames a bit more.
Unless you have evidence of what the framerate is then this argument may or may not be accurate - we just don't know.
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