It's a touchy subject. Sometimes there are legit reasons such as when the DX didn't log the call correctly. For example, N4UFO had tried in the middle of the night but they reported his call as as U4, not N4. Ultimately it is the DX that sets the rules for their op.
The main reason, in my opinion, to avoid "insurance calls" (dupes) is so that you don't jeopardize someone's chance to make contact with a narrow window. I cannot tell you how many times I have tried to work UT1FG/MM in the middle of the night with a 2 minute window, only to have other stations jabbering with him because they assume nobody else is in the footprint.
It is hard to put ourselves in others' shoes. A little grace doesn't hurt. Some time we might need it ourselves. I know that I do!
73 Clayton W5PFG
On 8/25/2016 11:54, Joe wrote:
the expedition should keep track of dupes, in situations like this, and if discoverd all qso's from the offending station should be deleted from the logs.
Just my opinion.
Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com