This isn't the first incident with the device, as you might imagine. In crammed quarters for long durations, the Knee Defender is the catalyst between short fused passengers.
The device is relevant to tall people in particular, for whom legroom is the most constrained. In fact, an earlier post on this site did a survey, and found that 1 in 3 people visiting this site would use the Knee Defender. That's an astonishing ratio given the outrage this device creates.
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So, for curiosities sake, let's look at the other side of the fence. If someone used a Knee Defender on your seat, what would you do?