Sometimes QRM is really accidental. I was wintering in Arizona. I found a dead cw freq, listened for a minute, and called QRL three times. No response. Called CQ, etc - the usual. No response. Radio off and went to cut the lawn. Received a friendly e-mail a few days later. A guy in the midwest. He copied W1AW on that freq and was doing code practice. He also heard me and I messed up his code practice. He was in the middle between me and ARRL HQ. The band was open to Connecticut for him but closed for me. So I sinned in ignorance, no fault of mine. Patience and a forgiving heart are still virtues - that is why the e-mail to me was friendly. Still do not know what I could have done differently. Life is not always fair or the way we want it - oh well.
I see your point but still not the same. This same scenario does happen on SSB but you can prevent the interference from a QSO much easier. In CW filtering a signal 50Hz to 500 Hz can be eliminated completely is possible but not in SSB. In CW it's not like you can just jump in and mention the interference with everybody if you know what I'm saying.
If there's a NET which has a group of people from all over the U.S. ,or across seas someone is going to hear you ask if "frequency is in use" in SSB. There shouldn't be any problem in telling that person "yes...thanks for asking". Even if the station was 1KHz away someone in the group should react to prevent further interruption.
In the scenario of two stations in QSO could be harder ,but what W1IT is talking about is that same group of people knowing that your having a QSO for the last 30-45 minutes 2KHZ away and they still start their NET. Then they have the nerve to come down and state that your interfering with them. It's B.S.!
Why can't they just move 1KHz higher?