It can be done safely, but if Tesla is compromised and their attackers gain access to their network and their signing keys, all bets are off. I would bet that

It can be done safely, but if Tesla is compromised and their attackers gain access to their network and their signing keys, all bets are off. I would bet that there are multiple unfriendly nation states who have intelligence groups persistently looking for ways to penetrate vital networks and secrets, like Tesla's, just to have the option of causing pandemonium if they wish to.