I would think that use of a rifle in a home defense scenario would be a *little* less ambiguous to responding LE. Then again there is the Sutherland Springs incident. I still would not hesitate to use a long gun in defense of house.
I have very limited LE training but in my military life so much emphasis was placed on preventing friendly fire because it was so big a threat and virtually none of those safeguards exist in a mass shooting event. I appreciate BB’s and Trooper’s sage advice as it may help those on this forum but in the end I guess everyone who carries a gun “pays their money and takes their chances.”
The only people who won here were those who would have been killed by the bad guy and the Bloomberg/Giffords cabal.