So, he's crazy because he doesn't want to regulate things. You believe homeopathy is bullshit - fine, I agree with you. We can campaign against it and inform people it's bullshit. But you and I have no rights to tell people what to believe and how to spend their money.
I would like to specifically talk about climate change, though. I don't want to question the legitimacy of the claims that it's happening - to the best of my knowledge it is. However, people somehow assume it's definitely a bad thing, which is simply not true. Climate may indeed change in one place and make life of people more difficult, while it may also change in another place and make life more prosperous there. No scientists I know of can predict what effects exactly and on which places climate change is going to have. It seems to me, people who are afraid of climate change simply want to preserve the status quo. Not a bad thing - everybody wants to protect their life and assets. But we must recognize it for that - an attempt to preserve the status quo, not save the planet for the greater good.
Back to Ron Paul: he may not be the guy I can agree 100% of the time on everything, but then you can never do that with anyone. Before trying to assess why he voted for this or that, one should understand the reasons why he did so. For instance, he voted against net neutrality, but not because he believed internet shouldn't be free - he believed the government itself cannot make it free, but competition can.