Which leakers would go to wikileaks and not one of the multiple international news papers that are happy to report on "secret police stuff, control over national media, poisoning of political enemies, assassinations" located in say Syria, Russia or China? Just looking at news paper in my own language, I think I will have a hard time to find one that do not publish articles about things in Syria.

What service do Wikileaks provide to leakers in those cases?