no, not disloyal. Dissatisfied. Inherently, institutionally, integrally dissatisfied.

They cannot bring themselves to praise, in an unqualified manner, anything about America.

THAT is part of what the linked article writers finally found untenable about their association with liberals -- the writers could not in good logic or conscience believe in the inherent inferiority, the inherent failure, the inherent evil that the liberals believe America to be.