[zipy124]

Because investment is often tax-deductible anyway now-days with modern policy trying to encourage this via huge tax-discounts on capex. Therefore tax-breaks on profits just allow existing owners to cash out cheap. The companies that need the help need capital, not tax discounts. Further to this the companies that are profit-generating, still require capital for growth, the small tax on profits isn't enough to make a difference in the scale of things for investment required since corporation tax rates are often so low.