Actually personally I would say that is over stepping the mark.
Who are we to tell another person what do to with his property. Property that he legally obtained, and is within his rights to do with whatever he pleases. The vehicles were all sold at public auction, the public had it's chance. If he wants to crsh them and set them on fire, he can. if he wants them as they are, he can. If he wants to give them away, he can. If he wants to sell them, he can.
Yes, I agree that I wish they were being preserved, but we can't save them all.