In what way not completely irrational? Why more rational than fearing immigration from Eastern Europe or the Caribbean and while I agree that you will never completely eradicate people’s prejudices we must never stop calling them out for what they are, a stain on the British psyche.
Because people from Eastern Europe or the Caribbean are not on a supposedly God given mission to convert us to their religions, laws, culture and customs. Because people from Eastern Europe or the Caribbean don’t use their religion as an excuse to attack random strangers on London pavements with machetes. Of course the majority of Muslims don’t do these things either, but unfortunately for them some of their more extreme brethren do, and this makes people wary and suspicious of the whole group. Now, I consider myself a reasonable, rational person who is not a terrible racist but when I was stood on a London tube train and a young Muslim man in religious garb and a rucksack boarded the train and then fished out the Koran to read whilst standing right next to me, guess what thoughts were running through my head? I didn’t move to the next carriage and I didn’t abuse him or give him filthy looks but I was apprehensive. Is this completely irrational of me?