The truly unfortunate part is that mankind isn't fit to rule. Not by any means. People are still inharently good, but the oppertunity to take from another if there is little or no fear of repercussions leads many astray. The want for more and the pride that doesn't allow another person to check you is another downfall. You can convince many, but not all, and one rotten apple can spoil the whole lot if left. But who is to say what apple is rotten when all have some bad?
I know that man does not have the answer to problems. The last 2000 years of wars, hate, violence, greed, and every other vice propogating and becoming the norm has proven that. Yes, you might say that many things are still good, and they are. But on the whole mankind has been reaching for something better and falling short.