“The family wants justice,” he said. “They need to know that they are heard, and they need to know that this type of conduct is wrong and they need to know that this is going to stop.”
I feel the phase "need to know" in this context is peculiar. It sounds like "want to make sure". My understanding to the sentence in bold above is that they want to make sure they keep updated with the status of this event.
So, what's the correct way to understand "They need to know that they are heard" in this context?
The full source.