Not having a stand your ground law just means you have a duty to escape/remove yourself from the situation if it is safe to do so. It does not eliminate your right to self defense or extend it to defense of another. If someone is being kidnapped, they reasonably could not escape.
That being said, I doubt it would be ruled in favor of a defendant in this case.
No, but it still isn't secure enough for classified information. The protocol is probably fine, but the weak point is the device. And the device can be compromised. Devices rated for classified systems never touch the public internet which makes them significantly less susceptible to being compromised.