Rowling reminds revolutionaries of weaknesses to be avoided: careerism (Fudge, Minister for Magic); individualism/egoism (Gilderoy Lockhart); emotionalism=a tendency to display or respond with undue emotion, esp. morbid emotion http://dictionary.reference.com/browse/emotionalism (Sirius Black's all-consuming hatred for Pettigrew and Snape, Harry's consuming hatred of Dudley, Snape, Malfoy--compare these with Dumbledore's self-possession); opportunism=the policy or practice, as in politics, business, or one's personal affairs, of adapting actions, decisions, etc., to expediency or effectiveness regardless of the sacrifice of ethical principles http://dictionary.reference.com/browse/opportunism: (Rita Skeeter, Gilderoy Lockhart, Umbridge), factionalism-A group of persons forming a cohesive, usually contentious minority within a larger group http://dictionary.reference.com/browse/factionalism , (Slytherin disruptive behavior in certain classes with other Hogwarts students e.g. Hagrid's); dogmatism=Characterized by an authoritative, arrogant assertion of unproved or unprovable principles http://dictionary.reference.com/browse/dogmatic (Percy Weasley, Umbridge); sectarianism= narrowly confined or limited in interest, purpose, scope, etc. http://dictionary.reference.com/browse/sectarian (Sybill Trelawney); bureaucratism, a bureaucrat is one who "works by fixed routine without exercising intelligent/[responsible] judgment," Dictionary.com, (e.g. Hermione's organizational efforts on behalf of elves at Hogwarts; contrast this with her intelligent/responsible organizational efforts with regard to Dumbledore's Army).
