Yes, Occam’s Razor applies.
Various LEO groups learn of a “potentially violent biker meet-up”. Expecting trouble, they show up in force. Really expecting trouble, they’re watching for the first hint of trouble, shooting the first guy who apparently pulls a knife on another. Shots fired, everyone starts taking cover & drawing weapons (of any kind). Furtive movements everywhere, cops start shooting anyone armed and showing any hint of threatening anyone. Soon 9 are dead, dozens injured/incapacitated, and the rest are hiding - activity stops.
High-strung cops expecting a fight, prepared for one, found one and piled on.
Occam’s Razor applies.
To me, it looks like a case of “sympathetic shooting,” a term that came into use after the NYC shooting death of Ammon Dialu. (SP?). He was unarmed, on a stoop. Four undercover cops shouted at him, “Freeze!” and “Show me your ID!” at the same time. When he reached for his wallet, one cop loosed a round, and then all four emptied their Glocks into him.
“shooting the first guy who apparently pulls a knife on another. “
Justified shooting. At least that is what they say on the concealed carry threads and 2nd amendment threads ...