Do i understand you have no problem if a substantial percentage of people in your society adhered to Neo-Fascism? Or Mysoginy? As long as they aren't violent, you believe this won't have negative effects? Like changing the political landscape for example, enforcing new laws in accord with these ideologies etc. You don't see how the spread of an ideology in society can have gravely negative effects without immediate violence from its supporters?
That's your own belief and it's not supported by any credible statistical research. The only ones we do have show a significant enough ammount of muslims in Europe do support many of the worst and most anti-European views on individuality, freedom, equal rights, free speech etc, for us to fear the growing of their social class. Particurarly worrying is that these attitudes prevail among Europe-born muslims, who actually tend to grow up more conservative and close to Islamic identity than their immigrant parents or grandparents. Contrary to teh liberal delusion they will all somewhat "forget" and "abandon" this culture:
ICM Poll:
40% of British Muslims want Sharia in the UK
20% of British Muslims sympathize with 7/7 bombers
NOP Research:
62% percent of British Muslims say freedom of speech shouldn't be protected
1 in 4 British Muslims say 7/7 bombings were justified
78% of British Muslims support punishing the publishers of Muhammad cartoons
http://www.cbsnews.com/stories/2006/08/14/opinion/main1893879.shtml&date=2011-04-06
Belgian HLN:
16% of young Muslims in Belgium state terrorism is "acceptable".
ICM Poll:
25% of British Muslims disagree that a Muslim has an obligation to report terrorists to police.
Pew Research (2007):
35% of young Muslims in Britain believe suicide bombings are justified (24% overall).
42% of young Muslims in France believe suicide bombings are justified (35% overall).
22% of young Muslims in Germany believe suicide bombings are justified (13% overall).
29% of young Muslims in Spain believe suicide bombings are justified (25% overall).
http://www.pewresearch.org/files/old-assets/pdf/muslim-americans.pdf#page=60
Populus Poll (2006):
16% of British Muslims believe suicide attacks against Israelis are justified.
37% believe Jews in Britain are a "legitimate target".
http://www.populuslimited.com/pdf/2006_02_07_times.pdf
http://www.danielpipes.org/blog/2005/07/more-survey-research-from-a-british-islamist
GfK NOP:
28% of British Muslims want Britain to be an Islamic state
http://www.civitas.org.uk/pdf/ShariaLawOrOneLawForAll.pdf
NOP Research:
68% of British Muslims support the arrest and prosecution of anyone who insults Islam;
http://www.cbsnews.com/stories/2006/08/14/opinion/main1893879.shtml&date=2011-04-06