He sent a message 2 mins before the attack, and they want to know what that message was and who it was sent to, in case he wasn't acting alone. However, can't

He sent a message 2 mins before the attack, and they want to know what that message was and who it was sent to, in case he wasn't acting alone. However, can't they already find out who the message was sent to? Whatsapp obviously has to have that information, and it appears they will give it to law enforcement: https://www.forbes.com/sites/thomasbrewster/2017/01/22/whatsapp-facebook-backdoor-government-data-request/#610bc0601030 https://www.forbes.com/sites/thomasbrewster/2017/01/22/whats... I'm not sure that knowing the contents of that message will really help more than knowing the person who it was sent to. It seems that they had this guy on their radar a few years ago, but didn't think he was worth keeping an eye on, so even if they could decrypt whatsapp messages it wouldn't really have helped them.