Well, spears and swords have been around for millennia and are still being used to kill people. If we waited for morals to catch up with technology, mankind would probably have become a footnote of history, a rather lame species which existed on the African plains for about 20 years before extinction. People will do good or evil, whether it's with the latest technology or not.

We have a lot to be proud of, actually. We've known about U-235 for more than 50 years and still haven't eradicated ourselves. Go us!