There may not be any real anserwers to this problem but one thing I am certain of is that sitting around a camp fire, toasting marshmallows and singing kumbaya is not one of them which means the entire liberal side of our country will be of no help. People who say we should consider anything from the attackers viewpoint are part of the problem not any part of the solution.

It just may be hard line Muslims will never fit in anywhere they are not in total control. If their primary goal is the spread of Islam, by force if need be, they will never become part of any country they migrate to other than as invaders. If you have a group of immigrants who refuse to assemulate and fit into the country they are immigrating into you can not allow them free access to your country. Instead of religion of Islam substitute cannibalism as the driving force of a group of immigrants and see how people feel about open borders. Extreme positions which will not change after migration should disqualify anyone from being allowed to come into a country. You can't eat my family or attempt to kill them if they fail to bend to your religion. Close the borders if you must but protect your people.