What is the primary reason that past federal wildfire management policy emphasized suppression

The main reason they past federal wildfire management policy emphasized suppression was to avoid it burning uncontrollably and wrecking havoc than required or expected due to the unpredictability nature of fire.

Another reason was to reduce the damage and death of animals and organisms which had their habitat in the area. Depletion of these resources could have an adverse effect on the ecosystem thereby creating an imbalance.

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