While I understand the need for safety, I am not sure this is legal.
The consumers did buy the device and chose not to take Samsung up on the offer for a refund or exchange, knowing the risks and restrictions the government has placed on the device.
Now Samsung is pushing out an update that will disable the phones that people paid legitimate money for and OWN, sorry, but manufactures don't get the right to decide to force the consumer to do anything.
Samsung has handled this whole mess so poorly from the very beginning that I can't see anyone justifying their behavior.