Muslim "threat" to Europe

As justifiable anger against the demented president of the United States grows over his endorsement of a racist and anti-Muslim group in England, there is a timely report of a discussion under the ambit of the European Parliament about a book analysing the effects of Da'esh in Europe. Professor Olivier Roy asserts that "Isis" is no more threatening to Europe than other millenarian or terrorist organisations that preceded it, and that have since disappeared. One may demur over this reassuring opinion, but more to the point is the professor's hard research over a long period which shows that: 
young radicals are living at the margins of society of the Muslim population in Europe. The large majority of Muslims reject them and their actions.
Trump's demonisation of non-white and/or non Judaeo-Christian communities world-wide mirrors his atavistic attitude to the North American population. It is high time we on this side of the Atlantic by-passed the presidency and spoke to and gave more publicity to other pillars of United States democracy.