Much ado about intolerance

Call me stupid, if you will (WHAT? You do not need an invitation? You would do it anyway?), but I really did not understand what this brouhaha about intolerance was all about. I mean, humanity has always been intolerant. Comes of climbing down from trees but not leaving all the animal instincts behind, I suppose (that one, specifically, of fearing strangers). Anyone, who is not one of 'us', has