Which explains the surge in support for the Swedish Democrats, for example, which would have been unthinkable just a few years ago.
The situation in Europe is disconcerting for a few reasons. First, in multiparty democracies it does not necessarily take a voting majority to put these groups into power. Second, if they are shut out of power with substantial support (i.e., the National Front) and without the concerns of their constituents being addressed in some way, you are effectively ignoring the problem and creating substantial resentment, particularly when there is a fairly clear preference for not addressing the ethnic and religious fault lines being created as a result of the immigration crisis.
I also think that some people in the left (critical race theory types) have some responsibility for this; for years they have been conflating non-racist but pointed critiques of Islam with racism in order to shield criticism of Islam, particularly in Europe. Well now the real racists are coming out of the woodwork and building political movements, and they are using the pretext of false accusations of political correctness to their advantage as a recruiting mechanism.