I feel like this may be a bit juvenile, but can't hurt to bring it up. I'm a veteran with a BAS in Emergency Management, but I am also a substitute teacher. I've seen my share of fights, and the best way to help cooler heads prevail is to make people sit down. Could this be an option in an area that is blocked off and where people could be safely corralled? This could work for any event, not just the inauguration. We have kids sit down their whole lives to better control them when they outnumber us in class, why not outside in protests? Truly peaceful protestors won't have a problem with this & could even bring chairs. It couldn't hurt to try it, similar to the sit-ins of the past, to "Sit in Solidarity".