I doubt it is. I looked in Bartlett's Familiar Quotations and it wasn't there. That in itself doesn't necessarily mean he didn't say it but it isn't language that Franklin would have used. He wouldn't have said bad guy. Nowhere online that claims it as a Franklin quote cites a source.
Random factoid, I used to golf with a guy in my men's group that was the second known person to ever barefoot ski. I only knew him during his 70s/80s and you would never imagine he was a daredevil as a kid.