Right, because the knee is solely the patella, the quadiceps muscle belly extends over the femoral condyles, and the femoral condyles are a tiny part of the body. Please study your human anatomy before making opinionated assumptions.
http://www.webmd.com/pain-management/knee-pain/picture-of-the-knee
Argue and make fun of me all you want, I've already provided all the anatomical and biomechanical knowledge available (with citations and examples versus anecdotal arguments and nonfactual assumptions) and have nothing more to say unless there are any further specific questions or requests for clarification. I'm going to keep kneeing the way I'm kneeing for decades to come, the same way I've kneed in Thailand and the same way I've kneed in academic and clinical studies.