Politeness is not saying certain things lest there be violence; civility is being able to say those certain things and there won't be violence.
A recent series of polls indicate that European public opinion is substantially concerned by the increasingly aggressive Islam that their substantial immigrant populations have taken to expressing. To quote Soeren Kern, Senior Fellow for Transatlantic Relations at the Madrid-based Strategic Studies Group:
The findings – which come as Europeans are waking up to the consequences of decades of mass immigration from Muslim countries – point to a growing disconnect between European voters and their political masters regarding multicultural policies that encourage Muslim immigrants to remain segregated rather than become integrated into their host nations.
The survey results mirror the findings of dozens of other recent polls. Taken together, they provide ample empirical evidence that scepticism about Muslim immigration is not limited to a "right-wing" political fringe, as proponents of multiculturalism often assert. Mainstream voters across the entire political spectrum are now expressing concerns about the role of Islam in Europe.