Peace through violence?

From Radley Balko, at the Washington Post:

The police official in the video is saying that sometimes, state administration of violence is a prerequisite for peace. In other words, to obtain peace, violence is inevitable.

Of course, sometimes, we do need police officers to protect us from dangerous people. But to begin from the position that peace can come only through violence risks converting a police fear of violence into a guarantor.

Scary.