Quoted from goatdan:
I was in Estonia recently, where I paid to see a museum of torture devices. I'm not going to pretend that I "loved" the devices that were there, but it was fascinating, historical, and gave you perspective on what was happening in the days that stuff was used.
If I was in for a Predator, I would much rather any remaining prototypes be on display with those locations acknowledging the historical perspective to ensure that a future Predator situation didn't happen again, while ensuing that what did come of the situation can be seen and enjoyed by the majority of the people.
The only other option I see is for someone else to hide it away, which I don't think is a positive for anyone except the person doing the hiding.
If you were tortured by one of those devices in the museum, would you still like going back to the museum to see it on display?