I am not corrupt and I say otherwise. The US tax code has a massive amount of complexity and tons of corner cases and grey areas. I wish that were not the case but politics being politics, here we are.
Even if it couldn't produce a perfect tax return for me, it would still be much easier if all I had to do was (for example), click a few buttons to upload a few tax-deductible donation receipts, enter in the amounts, read through the rest of the return, and click "Accept".
Even if 20% of taxpayers still had to do their own returns from scratch -- which almost certainly would not be the case; virtually no one would have to do them from scratch -- automating it for the 80% would still be incredibly valuable. Even with a manual check/amend/approve step. It would save taxpayers tons of time and billions of dollars of tax-prep fees.