Trump did react differently to the two tragedies, for two reasons.  With the terrorist attack in New York he plays to his base big time and his purposeful need to call others names and throw nonstop accusations to put down others.  That hate and blame is pure bigotry and it sells real well to a certain conservative voter.  With the Las Vegas terrorist attack, he faithfully and very Republican minded succumbed to the NRA narrative that huge firepower in the hands of anyone is extremely profitable to a few, and the fact that the death toll in America is horrific is just gosh darn inconvenient.  Nothing to say, plus the glorious shooter had his rights. That absolutely nothing can be done to stem our harvest of self-inflicted carnage.   Our founding fathers and tradition demand it.  Plus, some of them certain conservative voters may have to rush to Washington with those weapons at any time, to protect their idea of freedom.