No, compassion does not make you a nice person to hang out with:

"Compassion is the response to the suffering of others that motivates a desire to help. Compassion is really the act of going out of your way to help physical, spiritual, or emotional hurts or pains of another."

Giving your money to the Gates Foundation concentrates it on areas that are already receiving disproportionate help (e.g. from the Gates Foundation).