You're calling 'em perps. What did they perpetrate? A threat? To someone they didn't know was a cop maybe. For that, they deserve death? OK.
From where I sit, it's not that clear who the perps were in this deal - who was doing all the shooting? Maybe you have more info than I do, but the article doesn't make it clear that the 8 or 9 cops were in danger. Were both sides shooting or just one? I'd like to know the answer to that before passing judgment on the guys who got shot.
The perps threatened to shoot the undercover cop inside the club. The undercover cop called for backup. The perps ran ouf of the club, jumped into their car and rammed the backup van and hit one of the backup officers as they were coming to the undercover cop's aid. The perps most likely sold drugs to the undercover cop in the club. The full story will come to light very soon.
Sounds like you're already against the cops. Cops shoot a lot of innocent people, but this sounds like the real thing.