Tell me, friend, how does a group of people enforce their rights within a country against those who wish to deny those rights?

ISIS wants a global Islamic caliphate, along with a Caliph at its head and Sharia law. They want this in the US, Europe, and every other country on the planet. They do not negotiate, because they believe they carry out the will of an omnipotent deity. And most importantly, they will brutally slaughter anyone who stands in their way.

So, how do we defend our rights to a different way of life, against those who would kill us for it?

Oh, and a cursory glance at history would be educational. Pacifism is a great idea, until it isn't.