Why won't Goodale Step Down?

It seems to me that most high-ranking people give up their positions while they are being investigated. Ralph Goodale and other Liberals don't seem to follow the same rules of etiquette. The argument always seems to be "Nobody has proven anything, so why should I step down?" Hey, Liberals, that's not the point. The right thing to do is to give up your position (whether you're guilty or not) until you are cleared of any wrongdoing. Other people seem to understand that, but I guess when you're as power-hungry and desparate as the Liberals, staying in power is the only thing that matters, and doing the right thing went out the window a long time ago.