In fact, in the same decade, three of the other most charismatic and effective leaders opposed to the US establishment also met violent deaths in suspicious circumstances that were never properly investigated - Malcolm X, Martin Luther King and Robert F Kennedy.
In all cases, Noam Chomsky insisted that there was nothing suspicious. Almost certainly, because of the influence he wielded amongst progressive circles, many who would have otherwise followed the trail that would have led to the killers of JFK, Malcolm X, MLK and RFK were dissuaded from doing so.
Thus the left of the 1960's was decapitated and those responsible were never unmasked and brought to justice.
Shortly after the terrorist attack of 11 September 2001 Chomsky pronounced that Al Qaeda led by Osama bin Laden had indeed master-minded the attacks, just as George Bush had insisted. Those who questioned the official account and pointed to the glaring contradictions and absurdities of the official account of 9/11 were dismissed by Chomsky as conspiracy theorists.