If they are found not guilty, but Nvidia believes they are guilty, then yes they should be let go.
Honestly if I was running Nvidia, I would not want such people around. The only way I would keep them if by some crazy circumstances these people were actually innocent, but I highly doubt that is the case. Which is why, even if they get off by a technicality or whatever, you can't trust such people to stay on with the company. They could burn you just like they burned their former employer.
BTW, reading the restraining order, it even lists specific hardware including the serial numbers that must be preserved! These guys will have their first court appearance Jan 17.