Is revolution always justifiable in means of global peace and security?

The only rule that I have is to always be skeptical of questions that ask if something is always the case (as hypocritical as that rule is facially). I am further troubled by the use of the Word "revolution" which can refer to a variety of very distinct activities, some peaceful and beneficial and others violent and destructive.

I would say that peaceful avocation of global peace and security, human rights and communal dignity is almost always justifiable. When it starts becoming more violent, I find it far less justifiable and its justifiability usually has an indirect relationship with the level of violence.