On MG one can at least comment back much of the time...same can't be said for many of Ferial Haffajee rants... like the one telling us that NKZ is not her husband and we are all evil for pre judging her...
I agree with you though that many of these movements have a point, but the ends simply don't always justfy the means. 
And of course intolerance knows no skin colour...that is curently not the real topic at the moment; what currently really is being debated is whether only certain races can be racists...