Rightontheleft says "These terrorists believe that they can frighten Western nations into withdrawing from Middle East countries like Iraq and Syria by using terrorist attacks".

Then why have  Muslim extremists attacked and  burned Christian churches and killed Christians in Pakistan?

Why have Muslims attacked Hindus in India?

Why have  Muslims attacked and killed people in the Philippines and in  Indonesia?

Why are Muslims attacking Africans in Sudan, Nigeria and Kenya, Somalia, etc?

Why are ISIS/IL Sunni, Muslims attacking  other Muslims and Yazidis in Iraq and Syria?