Gandhi’s non-violence was of extreme (Charam-panthee) type and anything extreme is unsuitable for human society specifically when it was applicable only on Hindus of British India, who were followers of the Indian National Congress.
There can be no end to Islamic extremism as long we keep mum and remain politically correct. The only way to end the extremism is to fight against it. One has to be really honest and call spade a spade. This not just extremism, it is radical Islamic terrorism.