I wouldn't want to say you're right or wrong but I'd only say that peace is priceless which means it's an ultimate possession that uprights humans kindnesses of living togetherly and happily as one while violence is destructive to human kindliness which erupts enemities and disasterous to the societies.
I also see some contradictions in his write up but to make it clear to OP violence shouldn't be the best option to peace in the society. I know that there are times when the only way peace can be restored in some certain situations is through violence especially in a state where no one wants to listen to each other yet I still do not see violence as a way of dialogue. People can actually settle their differences without resulting to violence because even if they choose to go in a violent way, a lot of things will be affected in the process and may not be restored back again after a dialogue so that is why it is not ideal to make violence as a way of restoring order in the society.
Just like you stated, violence results to negativity even after the parties in question must have settled their differences but the scare it will live can last for a lifetime that is why we should not result to violence because it causes some irreparable damages.