I don’t know what relevance the card trick has. Could you explain which bit I am supposed to be impressed by?
From your account, the question posed was, “which people should we retain in the U.K.?” (I’ve assumed that you made a Typo). The implication being mass deportation of all EU nationals. This presupposes that prior to the Brexit vote, people were told that EU workers in the fields of medicine, hospitality & catering, agriculture and social care would be deported. This is untrue and you know it to be so. So why are you promoting an agenda which you know to be based on a lie? It was made very clear that the U.K. would like more control over immigration so that the right skills and talent could be attracted and retained. In effect, that was precisely what the couple were doing, identifying people with skills which the U.K. would very much like to attract and retain.
Statistically, the couple from Mansfield are likely to be poorly educated, but not stupid as you smugly imply. In that area, schooling would have been orientated towards conditioning the males to follow their fathers down the coal mines and the women, their mothers into hosiery & textile factories. These people are not stupid, you are the idiot for branding them as such. With the closure of the mines and factories, they feel isolated, let down, abandoned and angry. Maybe they correctly or incorrectly blame the EU for that, but conceited fools such as yourself are too stupid to appreciate this.