Because we got used to the idea that who is not working, is consuming resources made by those working and putting in effort. Then those putting in effort say "if I could get resources without putting in effort, why should I put the effort?".

> ere is a very simple statement which may sound a bit mean: it is entirely feasible that giving a job to a “stupid” person, regardless of how much we try and train them, might cost the economy more than we benefit, in aggregate.

Well, if they don't put in effort, however small, and get resources, others will try to be stupid too. Or, they would not get enough resources, starve and those with empathy will be very vocal and use shame.