These particular rich people are not donating to a worthy cause. It's not a worthy cause. To continue their profiteering from polluting industries, with more government regulations that they write up, while they tax the poor, is not a worthy cause. Also, donating to clinics that give out cancer-causing treatments to cancer-patients, isn't a worthy cause either. If they wanted to "cure cancer" they'd open up plant-use homeopathic clinics that give the body plants to help the body cure itself. Notice how they don't do that, they don't give out things that help the body cure, they give out cancer-causing treatments to already-sick people. Try actually learning something useful with your time, not just repeat your holy-government's talking points.
