Just as there were various Hominid species (most of which died out) Sunderland maintained a very narrow DNA pool, observing incestuous behaviour. That's why the buggers are close yet so far apart.
The whole thing stinks to high heaven. So he lost his temper? He's not the only manager to lose it but could you see Fergie or Wenger do that? I doubt it. Pardew has no class at all.