They was planning a group to take over the leaf village...This is explained when Tobi talks to Sasuke about the truth of Itachi
Question...
People that are held down unjustly should just except that?
Jews blacks pretty much everyone is evil for fighting for freedom & equality?
Better yet u maybe a 10 yrs old so the sayians are evil because they revolted against freiza?
Ontopic tobirama is, the only evil character period not even hidan cuz its religion u can't judge ones religion not kakazu its a job he doesn't even kill just captures well it may depend, on the terms not sasuke just seeking retribution
Uchiha are just regular people, with beliefs not evil