I respectfully disagree. Police do not require security clearances and training to have your own surveillance system. Private individuals and businesses can and do own them. Stalkers cannot use a decentralized system that is split up at the individual and business level. We'd have millions of different surveillance systems all spread apart on different networks and with different data storage.

For example my home has street facing and entrance cameras. That's perfectly legal. It's in the public, and my cameras do not point into anyone's bedroom.