Most police officers and law enforcement are masons. I’d be more surprised if he was not a mason. That being said, they usually don’t display quite so publicly.
Dimitrios pagaourtzis is the shooter. I’ve been posting various links with little fanfare. Archive his YouTube channel offline. Here’s a link.
https://www.youtube.com/user/ThatKidKlutch
He has some videos of him rapping. Goes under comma Kazi