ICal and time zone stamps?

Apologies that this is long. It's three questions about trouble I've recently encountered using iCal.
I imported 80+ appointments into iCal from a .ics file created by Oracle Calendar.
1. The .ics file did not contain any time zone info, and iCal associated each of the imported appointments with GMT, despite the Mac's zone set to "Denver" in the Date & Time preference pane and iCal's time zone set to "America/Denver". Why doesn't iCal associate unassigned appointments with its own time zone?
2. Each of those appointments appeared in iCal at the correct local time, despite being associated with GMT. That is, with iCal's zone set to "America/Denver" I would have expected an item imported as, e.g., 10:00 GMT to show up at 17:00 in the iCal window. But none of them did--they all appeared as if they were MST, but with GMT stamps, and I don't understand why.
3. I didn't actually find out these items were associated with GMT until after I synced with my Palm Tungsten E. All of the items imported as GMT were shifted 7 hours on the Palm. So I went back to iCal and for each and every one of the imported appointments I changed the time zone to "floating" and then "America/Denver". (If I went straight from GMT to MST the appointment jumped 7 hours back in time, and I got tired of this.)
After that process, every event in iCal was associated with MST. I then synced with the Palm and found that, to my surprise, the imported events still showed up on the Palm as if they were GMT, i.e., shifted forward 7 hours. I should add that I didn't merge, I told the sync conduit to erase the Palm's contents.
Back to iCal. I used "Back up Database..." and "Revert to Database backup...", then sync, telling conduit to erase Palm's contents. No change.
Back to iCal. I select one of the troublesome events, "cut" it to the clipboard, and then paste to bring it back. After a sync that one event shows up correctly on the Palm, i.e., as MST as intended.
The question at the end of a long #3 is, if an event is imported with the wrong time zone stamp, why does it retain that stamp despite being manually changed to a different time zone?
I know the knowledge base has an article on incorrect time zone stamps, and that a possible fix is to export the entire database and then import to a new calendar. I didn't find this out until recently, and it doesn't address iCal's behavior so much as provide a workaround.
PowerMac G5 DP 2.0 GHz   Mac OS X (10.4.4)  

After looking more closely at the .ics files exported by Oracle Calendar I see that events are exported as if they were GMT; iCal is, indeed, showing the appointments at the correct local time. This makes my first two questions irrelevant.
However, question #3 still remains: why or how does the original GMT stamp persist after manually setting an event's time zone to local time, "America/Denver"?

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