If someone wants something bad enough it will be done, however, in most cases we follow these best practices to eliminate the threats:
Dome vs. Bullet vs. Turret: Some camera styles and types lend more to protecting against threats of damage, vandalism, or theft. A vandal-proof dome camera for example can be hit with a sledge hammer and continue to be fully functional. Bullet and Turret cameras provide other benefits but are not as protected against threats.
Installation considerations: How the cameras are installed can provide additional protection, including specific mounts, protecting the wires, security screws, and other methods.
Placement considerations: The height and location of the camera can deter would-be vandals, along with ensuring cameras cannot be compromised from the side or behind without another camera providing coverage.
Cloud recording: Recording to the cloud can help to provide footage in the case of theft, vandalism, or damage because you would have record of the incident in the cloud.