If it is fair to be concerned with the followers of Meir Kahane and their influence on the government of Israel (and I think it is), it is likewise fair to be concerned with Islamic immigrants and their beliefs when they seek to enter someone else's country. Most of the countries they come from have jihadist citizens and endorse a theocratic monoculture including laws on the books of heresy and blasphemy which are applied to ALL citizens, even if they are not part of the monoculture. A lot of the rising antisemitism in Europe is due not to generational Europeans, but the new wave of Islamic immigrants. It is a valid concern to people who have a chance to stop such problems at their borders.

At the same time, it is not wise to go all squirrelly and protectionist to the nth degree. Syria became a horrible place to those who did not have a 'dog in the fight' i.e. were not eager to live under Bashir Assad and were not prospective ISIS members. They do deserve a hearing and a refuge, at least temporarily. I tended to go along with German PM Angela Merkels' philosophy of opening Europe to these new migrants.

I'm saying that there are valid reasons to question mass immigration from such different places. But it calls for deliberation and decision making, not knee-jerk responses and canned platitudes.