Leftist radicals have no tolerance for “failing the cause”, and are the first to throw their own kind “under the bus” for not being perfect.
In this case, Chomsky is probably enraged, probably close to his typical state of mind, that Chavez has “failed the revolution” by getting cancer.
Chomsky assumes, or maybe knows, that Chavez’s cancer is terminal, so Chomsky has no more interest in Chavez, but has instead decided to discover the next radical messiah.
Exactly, the first things communists do after taking over a country is execute or jail any weak communists. Especially if they are not directly involved with the takeover.
It isn't pretty.