You're like the third or forth person to miss this and I'm not sure why.
Trusting Groza isn't actually the issue. If it was her I would say hit the detonator in a heartbeat.
But its not. The chances are too high that its a direct order from the commander that she can literally not disobey. That's what you're putting faith in here.
You're not saying you trust Groza here, you're saying you trust the chances this isn't an order from a commander who will happily throw our lives away without a second thought.