Shopping – Certain parts of the Beis Hamikdash were allowed to have dead people in, and the parts that weren’t was because of the Tumah, and we are all tomei meis anyway. So I don’t really understand that pshat.
It makes lots of sense, by the way, that the rm”a was lechatchila – it isn’t called ???? ???? ????? if you are not doing whatever you would do at home in the ????.