Fire is natural, yet you must consider the ecosystem. There are fire dependent (lodgepole, ponderosa pine) and there are fire independent (sonorana desert). systems.
Many lower elevation areas of AZ are fire independent. Fire historically did not play a role. One of the reasons these areas are buring is due to the introduction of exotic species (cheatgrass, red brome, salt cedar) when the west was settled. These exotics are fire dependent. They thrive after burning and can outcompete native independent vegetation. So fire is natural. It just has a different role depending on the vegetation.
As far as firewise. People should do more to protect their homes. This does not deflect from the tragic loss of firefighters.