Oh the irony...
The only way paying off the bond is not a better option is if you can get guaranteed returns higher than your interest rate. (Or expected returns if you are risk seeking and prepared to gamble)
People that blindly believe bond first and there is no way to beat the very low interest rate on it is a bit like when you walk past a man standing on a soapbox and shouting that the world is flat. No one ever argues with him because they know that if he honestly believes that then waving evidence at him is a waste of time.