How about ...
We've got one big network all around the globe and computers are timestamping things on it; if we're all running on different clocks any time comparisons (log files, for example) are difficult or meaningless so it's neat if we all use the same time and sync it to global clocks using the likes of NTP. Great -- now we're all on the same page.
Except -- only people living around latitude 0 degrees actually use UTC day to day and some of them use daylight savings so UTC isn't the best choice for knowing when the bar is going to open.
Solution -- set the computer to UTC but adjust it to show the local time for the user. This is sweet for long distance travelers too; they only have to change their timezone as they move around; the computer clock stays on UTC and doesn't have to be adjusted according to where the computer happens to be.