That's the scientific truth. But if some researcher were to set up controlled experiments in order to get rats to immolate themselves spontainiously - well, great good luck to him and his reputation. Since there is no plausible mechanism for ignition that has been advanced skeptics have offered alternative explanations. I should hope not. Me, I've learned to be skeptical about skepticism.
History is littered with examples.
Skepticism has more to do with the evaluation of these claims. Sure, scientists are wrong all the time. But these mistakes teach us to see our own stupidity and biases can subtlety affect the work we do. This is why we try to be methodical, careful, and always look for new ways to test our ideas. In my experience the supporters of many of the beliefs listed on my links page do not apply the same care to their work.