Small businesses cannot do anything worthwhile with a cut on personal business taxes, so that hurts your entire argument. Doesn't matter how large or small the business is, or what industry; we all need demand. Tax cuts don't do it because the lionshare of reduced tax burden falls on a) large multi-national corporations that already have hundreds of billions of dollars of cash languishing, or b) an extreme minority of people who's additional investment and consumption into the market is too miniscule to even have any effect on aggregate demand.