 Lieb also opines that while his harshest critics (who mostly came from the General Staff) often said that Rommel was overrated or not suitable for higher commands, envy was a big factor here (Simon Ball also notes that this was the single group of people in the postwar West who had an interest in denigrating Rommel, who had never been one of them, while he opines that various elements in English and German post-war government and military circles had an interest in praising him as well).The extent of Rommel's involvement in the military's resistance against Hitler or 20 July plot is difficult to ascertain, as people most directly involved did not survive, and limited documentation of the conspirators' plans and preparations exists.Thus, Rommel's participation remains ambiguous, and the perception of it largely has its source in subsequent events (especially Rommel's forced suicide) and the post-war accounts by surviving participants.