New Mexico recently released teacher ratings, 50% based on standardized test scores. The teachers are hopping mad, because they know that the evaluations do not truly measure their quality, and the tests are not good measures of what students know and can do.
In Taos, teachers burned their evaluation reports. Teachers in Albuquerque also burned their evaluations as a sign of protest.
During the Vietnam war, anti-war protestors burned their draft cards. Feminists burned their bras in protest at the Miss America contest in 1968.
This is a venerable protest activity against injustice.