The point is, bonehead, that the "bucket of water" example has nothing
whatsoever to do with woodworking, dust collection, dust explosions, or
anything else even remotely relevant.
Obviously, I cannot state, with certainty, the chances of anything
bursting into flame. Nor can you. Conversely, you cannot state, with
certainty, that something will "never" burst into flame.
It's not a question of flammability but of precision in meaning.