It's not as salacious as you make it out to be, a DH crew needed to be on the plane. Moving crews, causing pax to be bumped is a daily occurrence. You may not like it, but that's business.
Well, lets see. For an airline to have any business at all pax must be willing to pay fares.
If an airline send a message that us fare paying passengers are just scum to be beaten up for their corporate convenience then that makes our fare buying decisions easy when considering where to spend our money.