The FBI has requested that the families of the victims be able to submit amicus briefs to the court regarding this case. So the judge will literally be reading

The FBI has requested that the families of the victims be able to submit amicus briefs to the court regarding this case. So the judge will literally be reading their statements. This is a somewhat questionable practice, as this particular case will be decided as a matter of law, which is really only supposed to be about looking at the letter of the law, past cases, and the actions of the FBI with respect to these. So, you're right, it's not relevant but it's also not irrelevant, especially as it undermines the FBI's narrative.