Because we have their complete story I guess, also because there is a level distance and detachment from the subject. Plus a factor of it is that there tends to be a projected image of a person who is deceased.
I guess it is tied in with purity and (perceived) innocence.
I don’t think so, I think they just get deployed in a different way. I think to a certain degree gadgets and apps have helped people express themselves more. This of course can have negative and positive connotations.
No and I wouldn’t want it if there were, perfect is boring.