re: #4 gocart mozart
I think this description of a tankie by an ex-tankie gets at what partly motivates Glenn Greenwald.
She depicts tankism as an ideology defined fundamentally by anti-Americanism. She describes a process by which people with some justifiable anger against America — due to its treatment of minorities or overseas military actions — slip into a deep and monomaniacal hatred in which America defines evil and anything that opposes America is defined as good.