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While I agree with your logic that I shouldn't be too concerned with catching something from some infected guy ten rows behind me, you skim over the fact that people are packed into the cabin almost cheek-to-cheek. I'm REALLY concerned about the people next to me, behind me, and in front of me. If I'm unfortunate enough to be in the center seat, then there are eight mucus factories within three feet of my head, and if any of them have the flu then I've got an undeniably higher chance of getting sick.
I understand that you have travelled a lot, but being a pilot I assume that you are not always packed into the cattle car with the majority of the passengers. You're lucky.