Lots of small forest fires are better than a few huge forest fires. Without human intervention forest fires should be frequent but small. When humans prevent all fires the fuel accumulates and eventually turns into a huge fire that cannot be controlled and does more damage than a lot of little fires combined. The idea of controlled fires deliberately set by humans is to simulate nature without allowing random fires in inhabited areas.

I don’t know the reasoning behind your local laws. But that’s the reasoning behind controlled forest fires.