"Intuit has a duty"

And that absolves your duty to actually look at the return to make sure whether or not it is correct?  You bought tax software, not a Tax God.  Software can have glitches, but that's why someone paid you good money instead of wasting bad money on Turrddotaxx.  If they are going to pay someone just to enter data into a software package, they could have just bypassed you and gone the Turbo route.