>>15837069The point was that during the time they see the silent the silent can actually tell people to do things.
So like when you're looking at a silent and someone tells you to fix your tie after you look away from the silent you'll want to fix your tie. That's how the silents were controlling humanity, through post hypnotic suggestion.
The video forced everyone to instantly want to kill a silent as soon as they saw one, rather than just cower in fear.
The thing is a fully invaded planet would probably have some silents still living underground, and there's still the business of why they were trying to protect this girl (the guy running the orphanage was being commanded to by silents).