Whiskey (and other distilled spirits) aren't really food products anymore - they are just ethanol and water with trace amounts of flavor, aroma, and color compounds from the barrel (or from spicing).
Beer/wine can 'go bad' from a few sources that don't really affect spirits:
Oxidation of organic compounds in beer/wine causes staling. Since spirits lack carbohydrates and proteins, there isn't anything to oxidize. Actually, I believe the same is true for mead (per Michael Fairbrother in an NHC talk this year, I don't have much experience with meadmaking, just meaddrinking).
Infection is not an issue with distilled spirits because of its high alcohol content and low nutrient content.
I'm not sure if distilled spirits are susceptible to lightstrike. I'll have to look this one up.
No yeast carries over in the still runoff, so autolysis won't affect spirits.
Did I forget any other ways to ruin beer?