"I know of 3 major fires started this way by irresponsible shooters..."

I don't know if they can be called irresponsible shooters, but I have seen Navy SEALS training at my old range in central CA start more than one fire with an M-60 and tracers. CDF Batt Chief tried to bill them once, even though they put out their own fire before the fireguys got there. Didn't get far with that.

And one time I was patrolling down I-5 and spotted a small fire on a ridge near the frwy. Called the fireguys, then went up and stomped the thing out myself. CDF later discovered that it had been started by a tracer. Drive-by arson I guess...