(Is it just me or is that link broken? It may just be my computer. IDK.)
I think in order to be the "purest possible expression of hope in superhero comics," P.S. pretty well has to have a human side. Otherwise he becomes a very alien character and people find it hard to identify with or like the fellow--which, I suppose, is the problem some people have with him, because some writers don't bother keeping up his human side.