A logical deduction can tell you nothing that is not already embedded in its premises. All a logical deduction does is enable you to determine whether or not some conclusion is consistent with some set of premises.
A lot of people don't like magic because it make them feel stupid, but getting fooled by magic tricks says little about your intelligence. Indeed, the annals of science are replete with accounts of brilliant professors taken in by dime-store swindles.
Is the benefit of the extra oil we will get from deepwater drilling (half a year's worth of additional crude) worth the environmental risks of another major accident? The Obama administration has obviously decided yes.
When the MPAA gave the romantic comedy "It's Complicated" an R rating, they were making a very clear statement: showing successful, cosmopolitan adults enjoying marijuana with no consequences is somehow worthy of restriction.