I'm sure you don't mean to imply that if you were sitting in the courtroom during a murder trial for a sibling, you would be giggling and chatting during testimony. Seriously, if you weren't there to hear the testimony, why would you bother attending?
The morning that I was there they were carrying on during the testimony of the CPD. It was just really odd and maybe you needed to be there to fully understand how awkward it was.