See also this personal essay from Norm Stamper, chief of the Seattle Police Department during the WTO protests in 1999:

"The cop in me supported the decision to clear the intersection. But the chief in me should have vetoed it. And he certainly should have forbidden the indiscriminate use of tear gas to accomplish it, no matter how many warnings we barked through the bullhorn...

My support for a militaristic solution caused all hell to break loose..."

http://www.thenation.com/article/164501/paramilitary-policin...