You hope it's all combusted perfectly, but there's no reason to take the risk based on a hope. And the combustion byproducts aren't that much less toxic than th

You hope it's all combusted perfectly, but there's no reason to take the risk based on a hope. And the combustion byproducts aren't that much less toxic than the fuel. Also not all of the fuel will be used, so there's some in the tanks. That needs to be removed, and could leak if there was any damage.