Well, personally, I'm terrified of fire so I could never even consider it, lol, but I think that if it's used properly then it'd be fine. And breath play, maybe if both the dom and sub agreed on a way for the sub to let the dom know if it's getting to be too much, and do it in moderation. If that makes sense :) haha. Basically, I think that as long as both participants consent to any sort of play, as long as there's way to ensure its safety (for the most part) then it'd be fine.
v Well, fire play isn't necessarily dangerous, because there are tools to control the temperature of it. But some people don't use these tools, and that's when it becomes dangerous. Because direct contact with fire can cause shock. And as much as I like breath play myself, I can't honestly say there is anything safe about that. I can't protect breath play. xD
I don't think there's a problem with BDSM, only some of the participants. Like you said, not all / very few. I think there should be restrictions (no breath / fire play, etc) but the act of BDSM itself shouldn't be outlawed. That's like outlawing sports because of the possibility of people getting hurt. While some extremes should be taken seriously, it is consensual as well as a lifestyle.