PS and SS look very bad in this. But we shouldn't forget that Smith has a very large share of the blame. He started two projects with disjoint groups of authors and never explained to each of these groups that there was a conflict. He handled it terribly from the beginning until the end.
He should be responsible for the conflicts. Presumably Schiraldi contributed to their research but was unaware of the two disjoint project groups which led to such immediate aftermath.