Can we have better surveillance cameras to monitor secured areas?

It is common to see CCTV cameras at important places to monitor the movements of suspicious persons. These are located in super markets, restricted areas, traffic zones, bus stations, railway stations, airports, etc. On many occasions, after the occurrence of an incident, the footage from these helped to nab the culprits. But, the videos that we see in TVs are of poor resolution and less speed. It is beyond my knowledge why it is so and why high resolution cameras can't be installed for surveillance. Normally, the domestic cameras which we use provide good pictures of objects that are at distance, when we zoom. No doubt, the memory occupied by these high resolution pictures will be more and thus require large storage space, but it is affordable and cost should not be an issue when it is with regards to security and safety.
During accidents / incidents, cameras installed at important and critical operation areas also show how they occurred, even if the employees lie about them fearing punishment. This will help in accident investigation and help the organization to take preventive measures.