The reason why it is wrong in Europe to publish offensive cartoons in which is suggested that muslems are, in a general way, terrorists, or that islam is an aggressive dangerous religion, is not that one should not be allowed to express anti-islam sentiments to spare the feelings of the European muslem communities - but because it is entirely anti-civilizational, and a violation of the society that Europe after ages of war mongering has created, to let such 'expressions', which are not humorous at all and rude in every aspect, circulate in public space, as there are so many other anti-civilizational expressions which are tolerated but which should not be tolerated at all. A civilized society exercizes certain behavioral norms which makes it possible for every citizen to live in peace and freedom, and have his privacy protected; this obviously means that freedom of expression is never a total freedom, as all other freedoms are never total freedoms: they are all limited by the normal restrictions of civility.
A documentary program on Belgian TV exposed some shocking evidence of ignorance, detected at both Europeans and European-born muslems, of what a Western, European society actually is supposed to be. Some Europeans simply say that islam as a religion automatically encompasses terrorism, and feel betrayed by their government which does not appear to want to protect them against 'islamization', by which is meant a future under illegal, foreign, aggressive rule. So, they fall into the trap of the extremist rightwing political parties who exploit such sentiments. The reality that millions of muslems all over the world do not particularly pick-out certain jihadist passages from the koran but live according to the other bulk, has escaped them. Then you have the well-meaning muslems, born in Europe, who want 'a discussion with the non-muslems on an even level, as between two equally legitimate view points about the world and society, as equals' to make mutual understanding possible. This latter opinion implies that on one hand, you have secular, non-muslem society and on the other, muslem society. But that is not the reality at all and should never be thought as reflecting in any way what it means to live as a muslem in Europe. Secular, European society postulates that it forms a framework based on a set of civilizational norms and values and hence, rules, to which every citizen has to conform, whatever their religion, ethnicity, gender, hair colour or amorous interests. This framework leaves culture and religion free to be practized, in sofar as they do not violate the overall framework. Where a culture or religion clashes with this framework, they have to adopt to the framework which will have to take priority.
The crazy thought that an islamic view point of society should be, within Europe, on an equal footing with European secular view of society, results from the very different history of islam which never went through a process of separating religion from the state, as happened in Europe. Since islam is not merely a religion but also a way of life and a culture, the idea that you can make such distinctions may thus be quite difficult for serious muslems. It is a notion that will have to be accepted by anyone, living in Europe, and thus also including muslems. They are in the same position as jews, catholics, protestants, bhuddists, jehova witnesses and what you have.
Such a relationship between a secular, civilizational framework and culture / religion is not negotiable, because both the ignorant generalizations by non-muslems and claims of European muslems that their religion be treated as an alternative paradigm to the European civilizational framework, fuel conflict, and not understanding. Locals will feel threatened - and rightly so - if an islamic paradigm is presented as a possible, equally valid alternative view of society to the one they are born into, it would be a gesture of intrusion. And European muslems who, with comparable justification, don't want to be treated as 'second class citizens', will have to adapt to the overall framework to be able to function fully as Europeans claiming their rights, and such adaptation leaves ample space for religious adherence - which, in reality, is also practiced by the millions of muslems all over the world who sustain a civilized way of life. So, much - maybe all - of the irritation and rubbing which is felt all over Europe between a secular, post-christian society and muslem communities, is the result of ignorance and misunderstanding on both sides what religion is and should be, and what a secular Western society / civilization is and should be.
The mentioned framework is based upon universal civilizational values and leaves enough space for any culture and religion to florish under its vaults.... If ever, in some faraway future, there will be world peace and a harmonious living together of all the different cultures on this planet, it will be because this framework will have been created everywhere.