There's a question I can't shake. In hindsight, I just can't figure out why on earth Tywin Lannister and his soldiers murder every single person in the facility at the beginning of the movie. What is their purpose or goal for the attack? On first watch, I was thinking it was to kidnap the mother and daughter, but mainly to get the communication device. Once we know the mom's true goal, it makes no sense. She literally had the device at home with her that morning. Why murder all those people? Later, we are supposed to have a bit of sympathy for her in a, "I must do something terrible for what I think is the greater good", but her friends/co-workers didn't have to die, and it really makes her an irredeemable character IMO.
Only thing I can come up with is they needed to confirm the device worked and maybe free baby Mothra. Well, one, it looked like Mothra was leaving the facility with or without her. Two, I got no sense that the device was going to be stolen from her once it was shown it worked.
Am I missing something?