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They dont have enough heat to start fires generally. They are cold from their travel through space and the outer layer that does heat up on reentry tends to ablate leaving a core that is cold to warm on impact.

See: http://en.wikipedia.org/wiki/Tongu_meteor

But that one was something like 100 to 1000 times larger.

Sure, but relative to the risk of wildfire due to lightning these sorts of events contribute only a tiny amount.