[mindcrime]

I really hope people don't start doing this on their own.

While I disagree with your overall sentiment, I don't think you deserve to be downvoted. As a former firefighter, I definitely appreciate that you make a legitimate point about the safety aspects of this. Have a corrective upvote on me.

And FWIW, while my time as a firefighter was quite some time ago, at that time, my department had a whopping total of one Metal-X extinguisher which rode on our primary engine. But at the time, we considered a class D fire something pretty damn exotic and unlikely to be encountered. Given the ubiquity of exotic materials in modern batteries, I am guessing these fires are more common and I hope most departments are somewhat better equipped (and trained) for dealing with them than we were in 1995.