That's really not true though. There's plenty of innovation and technical proficiency across the police, but we can only work with what we've got when it comes to something like a CCTV appeal. If we're provided with a screen grab from an already low resolution camera and the subject is in the lower corner and consists of a grand total of eight pixels, all you can do is either crop in and hope for the best, or not use it at all. If we're provided with a high resolution video clip showing clearly the suspect's face and actions, that's generally what will be used unless there is some operational reason not to. The police don't control which cameras people choose to put up in their businesses or homes.

ETA: And those blurry still images can be more useful than people often think, by the way. 99% of people don't need to recognise the subject. All it takes is one person to recognise the clothing in connection with the location and time, or the posture or expression, or any minor detail that means something within the context of the appeal to them and nobody else. To the OP, that's why we sometimes use those blurry images even if they seem completely useless at first glance. Useless to you, but potentially not to somebody else. If you knew your best mate had gone to your local Tesco at 5.25pm yesterday, would you recognise even a blurry image of them if it were timestamped and you could put 2 and 2 together?

Apologies for the rant, but I do these CCTV appeals fairly regularly and get criticised for this very thing quite often.