No, there is nothing wrong with feeling grief for the death of people you don't know personally. I would argue however that it is different when it is someone you know personally.
Yes. I respect both men but that doesn't mean that I will stop others from expressing their feelings if those feelings are different than mine.
I don't disagree, but I still hold my position. You, myself, and others may greatly respect Gary for what he did that doesn't change my opinion that others may hold different opinions, or that they shouldn't be allowed to express those opinions.
I agree that he changed the world in many ways. The New York Times had a wonderful op-ed piece when he died that covered how far his reach was. However, I personally don't see the level of what was on the shirts as being high enough to cause this level of outrage myself. The shirts may have been tacky but I didn't see them as mocking or disrespectful to the man himself. And even if they were to some people, my point was mostly that the sense of outrage seemed to be directed in ways that seemed inappropriate.