Haha, gotta love the "stimulates the economy" argument, too. Yes, it does increase "cash flow" in a stagnant economy, and it does create some temporary jobs. The sad thing is that the cash evaporates when it flows its way to the end of the spigot.
If you build a $25,000 automobile*, it stays around for a while, uses some gasoline*, tires*, you pay taxes* on it, have it serviced*, and probably eventually sell* it. That $25K actually hangs around and does something. ( This* is money that stays in our economy).
If you build a $25,000 bomb, it blows up a building, kills some people, and it's GONE.