Refugees fleeing poverty, abuse, crime, war – atrocities, all: they’re people looking for a better, safer place. We all have a social responsibility to open the door and help those who need it.
Yes, the reality is that there will be an incredibly small percentage of the population who, through indoctrination or exposure, believe and will do harm to others. To those, apply all manner of resources to deal with them appropriately.
But never turn away the whole because of the actions of a tiny, tiny few.