Photography is an investment because the equipment is expensive. It is upon photographers to find ways of preventing gear theft. I think it starts with having a bag that secures all your equipment.
I agree. Aside from theft, there's also the possibility of getting the equipment scratched if there's no bag for it, which would be a bummer. It goes down to cleaning the equipment too since the camera is always exposed to dust.
Proper storage of equipment will guarantee durability. Are there anti-theft camera bags that you can recommend? Having insurance protection ensures that any other risks are covered. Also, handling equipment well prevents them from falling or getting damaged.
It's really important to always keep an eye on your equipment or have someone with you at all times during shooting sessions. The point about insurance is a very good idea too.