It hurts the economy, too.
Zarn!
Removing water from one end of a swimming pool and dumping it in the other end will not raise the overall water level.
In other words, taking money from the private economy to finance the public economy will not expand the economy. That stimulus simply took money away from productive private activities and fed resources to poorly thought out stimulus activities (IE cash for clunkers and home tax credits).
You two seem to be conflating something. The 'economy' is trade of services or goods. 'Wealth' is the buildup of assets (either relative or absolute).
Whomp's example is complaining that the stimulus spending doesn't increase wealth. Yeah, I can see how that's true (or at least, something to be believed). Redistributive spending certainly cause cause wealth to grow more quickly than the free market would allow - but the stimulus concept isn't trying to do that.
Stimulus is supposed to boost trade. It's to get people buying and spending, so that people can allocate their resources and continue specialisation of their services. Think about wealth again: someone can be wealthy in an absolute sense (i.e., have a PhD and a storehouse full of grain) but only really benefits the economy if they're taking and trading their assets.
Sometimes it's the flow of the water that matters. We can complain about stimulus, but stimulus can help free up frozen assets, and get them moving. Stimulus can prevent a hole in a resume, and prevent degrading of skills.
Absolute wealth increases in a free economy. Goods and services are exchanged and transformed. Each transformation increases total wealth, each piece of specialisation increases wealth. But this mechanism requires trade. If trade stops for too long, total wealth can decrease.
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Stimulus has to be done properly. The main weakness of the current government is that there's no one giving suggestions to the general populace about
how to spend their money in order to increase trade. People should be thinking about how to change their careers and skills to offer useful services, and they should be thinking of who they want to hire with their consumer dollars.