You have brought up an essential point, and I would suggest that you organize a Board of Overseeing which will take tangible steps to insure that the protesters do not cause visual pollution in the community. Just as various organizations have successfully lobbied against ugly, large or overly numerous billboards on the grounds that they create 'visual pollution in a community, steps need to be taken that the protesters do not inflict a similar blight upon their community. You and your Staff could draw up specifications for any exposed mammary elements involved, and provide consulting as well as engineering services, onsite, to rectify any documented violations.