1. A) It isn't a matter of whether people agree with my definition of Atemi, but whether it is inaccurate. If it is someone should prove it to be so.
B) Atemi doesn't have to cause harm and saying it always does simply isn't accurate. My personal examples of non-violent Atemi suffice for me - no ones gone to counseling yet, to my knowledge.
2. If you don't present any openings and someone attacks, are you not leading them into a strategically disadvantaged/weak position? This is a basic aspect of the Kihon Waza - it's why we learn the techniques in the Ma-ai that we do.
Anyhow, these are just my thoughts on the subject - like anyone else here.