Before some large number of people should sacrifice their previous interests on the altar of Carethulu, there should be some new reason why these others (not Carethulu) should want to do so (implying a different utility function for them).

I think the misunderstanding here is that some of you interpret the post as a call to change your values. However, it is merely a suggestion for the implementation of values that already exist, such as utilitarian preferences.

The idea is clearly never going to be attractive to people who care exactly zero about the SWB of others. But those are not a target group of effective altruism or any charity really.