One of the main reasons for the false promise to donate is mainly the power of social pressure. People tend to agree face to face in order to get the impression that they are doing the right and moral thing. Also, they do this in order to avoid the formation of an unpleasant situation between them and the stringers. Therefore, when this situation is over and the pressure passes, the potential donor no longer feels the need to make the actual donation.
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Alongside these data, it was found that donations that were promised in writing or in speech but were not transferred in an excessive manner contributed to a certain moral bond between the donor before the act of donating in the end. Meaning, the social pressure is a significant factor for the donation, alongside of course the moral motive.