Islamists are blowing-up or otherwise killing Muslims in Syria, Iraq, Iran, Afghanistan, Pakistan, Yemen and Bangladesh. ISIS attracted tens-of-thousands of Muslims from around the world to go to Syria to kill Muslims (and others, of course). That wasn't revenge against the West. That was to replace a secular govt with a theocratic, Islamist govt. Islamists have also engaged in terrorist attacks against Russia and China.

Not to mention the fact that anyone anywhere in the world who commits blasphemy or apostasy, or otherwise insults Islam, could be killed