Couple of things:
1) Citation needed. Particularly if you're talking about federal inmates, state, or both.
2) It's disingenuous (re: primacy bias) to lead off with murder and rape, which account for a far smaller portion of "violent" crime than robbery (which I assume includes burglary, in which the victim and perpetrator don't make contact) and assault (which, again, does not require the victim and perpetrator to physically make contact (that's battery)).
All of this is aside fact that an individual who allegedly commits a heinous act against another person or small group of people is in a completely different class from a large corporation whose products put millions at risk (and the executives and managers who sign off on those company's decisions). There is quite the destructive myopia behind the increasingly punitive (rather than rehabilitative) nature of incarceration for the former, when the latter get off so easy.