A lot of jobs which could be classed as bullshit exist, formalized as 'jobs' because of something missing from somewhere else.
Robin Hanson estimate half of US medical costs are not physical but people needing moral support/reassurance from others, dare I say if people feel unloved they crave attention?
Another cause of bullshit jobs is sometimes moral responsibility. Who looks after the severely autistic and those born crippled? One perspective is that these are bullshit jobs because, like the Icelandic policy demonstrates, it is strictly speaking possible to prevent some classes of these people from being born. Other people are going to be angry to hear that, since those jobs obviously involve a lot of effort and stress and they would think them the archetype of useful work.
I can understand that position but if your job exists mostly because of fetal alcohol syndrome then the moral high ground is due to be hit by tremors in the next economic crisis.
This is the kind of thing we don't like to talk about much but, and I'm sure I'm delusional, but reasonable people could hash out sane solutions to prevent most harm.
tldr; Bullshit jobs are going to exist on the contours of subjects we find to be touchy or gooey. This is why wedding planners exist.