Now you're justifying bank robbery by saying, because it was with a pen, it's less of a crime. Scale has nothing to do with it.
One more thing...no more minimum-security prisons. Armed robbery is, IMO, 2 crimes. Robbery, on par with embezzlement, and assault with a deadly weapon. 2 seperate crimes, PV, and they should have 2 seperate punishments...not the same punishment by calling it the same crime. As for your murder/manslaughter comparison, it doesn't work in this situation because murder and manslaughter are gauged by intent...not result. If I think you should die, get a gun/knife/baseball bat, and end your life, then it's murder. If I'm doing target-practice in my back-yard, in the middle of Montana, and you get shot because I'm not being careful, then it's manslaughter. Embezzlement and robbery both have the same intent...to take someone elses money. Murder and manslaughter do not.