The nuclear problems in Japan are mostly due to a natural disaster, earthquake and tsunami, and its unlikely that the nuclear disaster would have occurred if the natural disaster had not taken place.
That being said, I do not agree with building more nuclear power stations, and think that the existing ones should be safely decommissioned, (which is actually happening in many countries).
Bill Gates is entitled to his opinion, just as anyone else is, and regardless of how wrong people may think he is.
I think vaccinations have their place, and have saved many millions of lives, and to me, the people who want to see all vaccines abolished, don't give 2 hoots about those that will die, or be permanently disfigured or disabled, from preventable diseases.
Selfish people, who don't do much at all to help people in developing countries, but see fit to want to deny them the same choices that they themselves have, the right to choose whether they vaccinate their children or not.
Bill Gates, not only funds vaccines, he funds a great many other projects, to help people in developing countries. I think this is a good thing, if it is not forced on those receiving the funds.