Also, the more sensible objection to demandingness is that it alienates or exhausts people. This can lead not to moderation, but to a wholesale rejection of the ideology.
Ask for a 10%/​year donation to effective charities, and a fair number of people can do it or strive for it. Ask for everyone to live at the level of refugees in order to maximize their donations, and few are going to listen to your ideas on what constitutes an effective charity.
Also, the more sensible objection to demandingness is that it alienates or exhausts people. This can lead not to moderation, but to a wholesale rejection of the ideology.
Ask for a 10%/​year donation to effective charities, and a fair number of people can do it or strive for it. Ask for everyone to live at the level of refugees in order to maximize their donations, and few are going to listen to your ideas on what constitutes an effective charity.