I fully agree to keep politics to yourself. If you turn them into shooters, their views will start to turn all on their own. When training, I as several times if there are any questions, and if a political question comes up, I try to keep it short and succinct and then move on.
One thing I do in the very beginning is place my carry gun on the table in front of everyone and stare at it. When someone finally asks why, I tell them I wanted them to be aware of exactly how often a gun goes off without human interaction. "Unlike what the media has told you, no one can get a hammer to drive nails by itself, a car to drive itself or a gun to 'go off' accidentally. Human interaction is always required." It usually breaks the tension and sets up the basis for the reason their are safety rules.
“Malo periculosam, libertatem quam quietam servitutem." (I prefer the tumult of liberty to the quiet of servitude.). Thomas Jefferson
"All that is necessary for the triumph of evil is that good men do nothing."
-Edmund Burke, Loosely translated from Thoughts on the Cause of Present Discontents. (1770)