In a situtation like this, I always remember the saying on my beer squeegy, 'never underestimate the power of stupid people in large groups.' You might find post #82 interesting.
http://www.freerepublic.com/focus/f-news/1907203/posts?q=82;page=51
M1A2 Abrams Main Battle Tanks are not normal police equipment.
Don't they have armor plated battering ram vehicles?