I'm 6'5, I nearly need a harness everytime I stand up!!
But seriously..
Its always going to be the subject of lengthy debates.. However, in a house fire, i'll be up on the roof popping tiles for my interior crew, and getting ventilation while a few of you get your harness and fall arrest gear ready..
And yes, I have fallen through a roof in a house fire. Sure, you weigh up the risks every job you go to. Its a tough gig, but it has to be done. OH&S gets a little crazy sometimes.. In a controlled environment, I can see the reasons for putting every pre-caution in place.. (E.G, non-emergency site works etc). But like BM stated with the getting into cars, you have to weigh up the risks.. - Yeah, the airbag *might* go off, or the car *might* shift, but if the person WILL die if you dont get in there, I know where I would be!.. (In the car, for those trying to work it out!)
Same goes with a roof.. You *might* fall through, or you *might* fall off.. But if your crew need that ventilation, or if some one is up there and they go down for what ever reason (or rescue), like I said, I know where I will be..