These are the reasons they aren't a danger to our way of life, and it's also the reason you can't say why they are, all you have left is your paranoia and xenophobia, carry on that way and you're in more danger of returning to Fascism than there ever is in having to live under an Islamic State.
So you don't think there is any danger of Islamic extremists committing acts of terrorism in the west or outside of the middle east?
Well, you're a bit late
► USA - February 26, 1993 – World Trade Center bombing, in New York City. 6 killed.
► USA - September 11, 2001 – 4 planes hijacked by 19 al-Qaeda hijackers: two planes crashed into World Trade Center and one into the The Pentagon. Nearly 3000 dead.
► Indonesia October 12, 2002 The Bali bombings, 202 killed and 240 injured.
► Indonesia August 5, 2003 The Marriott Hotel bombings. Killed 12 and injured 150
► Spain March 11, 2004 – Madrid train bombings, killed 191 people and wounded 1,800
► September 1, 2004 - Beslan, Russia - School, 1200 hostages held, 300 killed, 156 children
► Indonesia September 9, 2004 – 2004 Australian Embassy bombing in Jakarta, Indonesia; killing 9 and injuring over 150
► United Kingdom July 7, 2005 – Multiple bombings in London Underground. 53 killed by four suicide bombers. Nearly 700 injured.
► India September 13, 2008 – Bombing series in Delhi, India. Pakistani extremist groups plant bombs at several places. 33 people dead and 130 injured
► India November 26, 2008 – Muslim extremists kill at least 166 people and wound numerous others in a series of coordinated attacks on India's financial capital, Mumbai
► Sweden December 10, 2010 Stockholm bombing, Sweden. killing the bomber and injuring two people
► China July 18, 2011 Hotan attack, Hotan, China. A series of coordinated bomb and knife attacks killed two people
► USA April 15, 2013. – Boston Marathon bombings.Killed 3 and injured 183 others
► United Kingdom May 22, 2013 – Two men with cleavers kill British soldier Lee Rigby in Woolwich
► Kenya September 21, 2013 - Westgate shopping mall attack, 67 killed, 175 wounded
Do you honestly believe that the people who live in these countries are completely unaffected by these acts of terrorism, that is has not affected them at all. Ask any New Yorker who was there on September 11, 2001 how it affected them. Ask Londoners, particularly those who use the Tube every morning, what impact the 7/7 bombings had on them!
And you are totally ignoring how it occurred. Fascism rose in Europe in many countries at the same time, and did so in response to the growing Communism threat. It built on the Western fears of Communism, their Xenophobia, and their sense of National Pride, things that are still very much in existence in our Western Society.
Islamic Extremism has nothing in common with Western Society, it simply can't, and will never get a foothold in it like Fascism did because Fascism is what happens to Western Society when we give in to our fears, just as they did in 1930's Europe.
And again, you entirely miss the point.
There are over 42 million Muslims living in the west. Even if the vast and overwhelming majority of them are decent Law-abiding citizens as I believe they are, there is still a huge potential for radicalization of a small number of them, and a small number of "sleepers" is all it will take to carry out another 7/7 or 9/11 attack.
The people who committed the 9/11 attacks didn't simply deploy into the USA just a day or two prior to the attacks, they were
living there for 6 to 18 months. Prior to that, a number of the terrorists were member of a Hamburg Islamic Terrorist Cell; Hamburg, thats Germany, another western country.
The 7/7 London Tube bombers were even worse. Germain Lindsay, was born in Jamaica but emigrated to England in 1990 when he was 5 years old. Hasib Hussain was born in Leeds, as was Mohammad Khan. Shehzad Tanweer was born in Bradford.
They were all British citizens Still think that
"Islamic Extremism has nothing in common with Western Society"
The facts are that while it might not appeal to the average westerners it still has the potential to appeal greatly to
disaffected Muslims living in the west, They are a prime resource for radicalization by Islamic Extremsists.