Relevance of non violence

When we talk about the Gandhian thought and non violence as a tool and its affectivity, we should consider few things. First of all who are the person we want to change. As Gandhi himself admitted that if the concerned people would be Nazi instead of English, he might have to adopt some other strategy i.e. may be non violence will be there also but with a different approach. Second thing patience required in this approach on a mass scale, have we have it? Third thing non violence will be more effective when a large mass follow it collectively against a lesser number. Aang san su ki in Barma and Dalai Lama in Tibbet are following it but for several years unfruitful. This not to say that violence will work either. If we consider Philistine movement, involving violence has made situation worse. On the very humanitarian ground it can be considered wrong and is there any right way to do wrong thing?