At the end of the day, here's why I think that this "feature" is broken:

I want to be able to enter an event and specify a start and stop time, and then tell my computer to NEVER change those times. Turning off timezone support should do that: it should tell your computer to stop screwing with your calendar.

When my computer takes it upon itself automatically adjusting my calendar, there are real, substantial risks -- i.e., it could cause me to miss a transoceanic flight.

I think that I should have the right, as a user, to assert that I know best when I set the times for my events, and to instruct my computer to leave the times as I have set them.