You only think the handlebars took most of the impact but you are wrong. The bike took the impact but the most outboard part...handlebars...appear to have taken the impact. The "really bad bump" may have caused the wheel to go out of true or the fall could have caused it. Overall it doesn't matter.
Turning the bike upside down for any reason is similar to putting your motor vehicle on its roof to change the oil...never turns out good.