What are your thoughts about the mass shooting in Moscow?

I’m mostly curious about your thoughts related to the Middle East and terrorism assuming you believe ISIS is responsible for the attack. Why did ISIS go after Moscow?

How can we combat Muslim extremism?

Do you believe Muslims have a history of imperialism and it is ingrained in their culture to want to take over territories and convert, and doing it with violence is acceptable among those who buy into this? A woman I know was talking about this, and saying Muslim Imperialism in the Middle East is easily observed by how they have systematically driven our Christians and Jews, and that we see it in South Asia also in the history and relationship between Pakistan and India.

All extremism is bad, but for this Q I am specifically asking about Muslim extremism and imperialism stemming from the ME. Christian, Jewish, and other religious and cultural extremism we can save for another Q.