Of course not all wealthy people are unfeeling sociopaths, but the percentage of sociopaths goes way up with the wealthy and powerful.  Also, don't forget that many of those donations are tax deductible and are good for public perception.  That is why so many of the timber barons and developers and other resource extraction industry leaders give donations for the children and "less fortunate."  Perhaps a little guilt from getting wealthy off of destroying so much of the Earth's precious resources.