Satyagraha, by definition, cannot multiply injustice as the entire goal is to convert the agressor into a cooperating with the solution.
"The essence of Satyagraha is that it seeks to eliminate antagonisms without harming the antagonists themselves, as opposed to violent resistance, which is meant to cause harm to the antagonist. A Satyagrahi therefore does not seek to end or destroy the relationship with the antagonist, but instead seeks to transform or “purify” it to a higher level. A euphemism sometimes used for Satyagraha is that it is a “silent force” or a “soul force” (a term also used by Martin Luther King Jr. during his famous “I Have a Dream” speech). It arms the individual with moral power rather than physical power. Satyagraha is also termed a “universal force,” as it essentially “makes no distinction between kinsmen and strangers, young and old, man and woman, friend and foe.”
Gandhi contrasted satyagraha (holding on to truth) with “duragraha” (holding on by force), as in protest meant more to harass than enlighten opponents. He wrote: “There must be no impatience, no barbarity, no insolence, no undue pressure. If we want to cultivate a true spirit of democracy, we cannot afford to be intolerant. Intolerance betrays want of faith in one's cause.”
Civil disobedience and non-cooperation as practised under Satyagraha are based on the “law of suffering”, a doctrine that the endurance of suffering is a means to an end. This end usually implies a moral upliftment or progress of an individual or society. Therefore, non-cooperation in Satyagraha is in fact a means to secure the cooperation of the opponent consistently with truth and justice."
Here's the link to this article: Satyagraha - Wikipedia, the free encyclopedia
If you read it I think you'll get a pretty good picture.