Vandalism at draft board offices as U.S. involvement in Vietnam was escalating was deeply divisive. Opponents of the war were stereotyped as dirty hippies and sanctimonious white college kids, but the anti-Vietnam-war movement in the U.S. was really broad.
Research:

Behind the Scenes Minis: Smashing Linoleum
19:47

Frederick Walton and the Invention of Linoleum
41:32

Swing Riots
36:33