Because we've already spent those tax dollars by allocating them to some spending program. In other words, we can't stop taxing corporations and based on current sentiments going around....the taxes on businesses are only going higher.
I agree it is stupid to tax businesses due to how international our economies are getting. Foreign companies can ship product into the USA but pay no taxes in the USA so they get an economic advantage by being in the lowest taxed country. The only tax they pay is import taxes.