Of course there is an element of subjectivity in what we each regard as ‘useful.’ And I’m certainly not suggesting we should have some sort of central authority to decide who is useful and who isn’t and then to apply some sort of ‘final solution’ !
Indeed, I make it very clear in my article that I think people should make their own individual judgements about which businesses are wasting people’s time and efforts — and simply vote with their wallets to shop elsewhere.
And what should we do with people who are engaged in wasteful employment? I think we should indeed retrain them. I think there are very few cases in which people could not be retrained to do something useful.