Fair point, but security cameras, despite their name, do very little for your security as evidenced by the news. Most people don't need one, and only have Rings/Nests and other similar spyware because of a combination of fearmongering, aggressive marketing, and pricing subsidized by data collection (spyware). If you truly fear for your safety, you should purchase a shotgun, not a Nest camera.

In any case, when you don't have the skills required to do something, you can hire someone who does. I pay a plumber because I don't have plumbing skills and tools, so it's not unreasonable to pay someone to set up a local camera system for you if you want one.

Cameras do more than just that kind of security.

Our camera has been of great use. In fact has largely made us money. We had an incident where a fire truck damaged our car in the street with its hose. We thought a kid with a bat did the damage at first. The camera though showed the real culprit. When we told the fire department they denied it and said there were no firetrucks in the area. We sent the video footage and then they sent a city lawyer with a checkbook.