I sure hope everyone who can has defensible space. There are some places, like up around Tahoe, where they've outlawed clearing defensible space, but if you can do it, it's good to do. When the big fire happened down along 395 in Alpine and Mono Counties, there was a picture of a teacher's place where had good defensible space. Everything all around it was burned black - but the house, cars, grounds, and family were fine.
The fire also came into Douglas County Nevada; we were fortunate in that our Nevada house has defensible space.
That was the fire where the poor fire fighting plane crew was killed.