I don't understand the reasoning to this, at all. The stats clearly show that over 70 with preexisting condition is by far the hardest hit demographic. Probably a good 95% of fatalities, the last time I saw figures. Is this perhaps Boris dealing with his brush with death, being obese (though not morbidly so) and in his mid 50s? The reasoning being that if it can nearly kill him, then it could kill others of similar age and health. The difference, of course, is that that we won't be going round shaking the hand of every Covid-19 patient we can find, thus exposing ourselves to massive viral loads.