If you're suggesting that Inmarsat employees are so terrified
You simply don't get it.
No one has to be 'terrified'.
No one has to be afraid of police action.
People do it because this is how investigations are handled, by fiat, by historical precedence, by mutual agreement, by common sense.
Investigators rather be left alone than having to reply to a line of outsiders (usually media idiots) knocking on their door asking for 'verifications' or 'explanations'.
Any press releases, etc are totally at their discretion, they are not necessary, they may chose to communicate only through official reports.