Its called the dopamine effect - the act of giving without realising or not knowing what it actually does. The high alone is sufficient.
Most charities are aware of this and thats where the abuse takes place. Charities are a major industry and growing at a phenomenal pace. Many of the big ones have private jets with the ostensible reason of reaching the needy in the heart of Africa etc.
It took me years before I had to overcome it. I now vountarily provide advice together with a due diligence group comprising of other liked minded individuals with accounting and legal background to foundations on who deserves it and the conditions that they have to comply. For instance, they cannot exceed 4% in terms of overhead. If not you will end up like NKF where over 90% went to NKF overheads and reserves and less than 10 % went to the needy. They collected right across the spectrum. It went on for years and the CEO's wife and children had an NKF Mercs and NKF chaueffer at their disposal.