“Los Angeles is a damsel in distress,” quoth Nick Nolte. “And I need you to save her.” Josh Brolin: “I’ll need men.” (Tee hee.) “You gonna take me away from all this?” purrs Emma Stone. “No ma’am,” answers Ryan (Fuckin’) Goslin. “I was just hopin’ to take you to bed.” “He’ll kill you if he finds out, ya know.” This is “Gangster Squad” — where a team of L.A. cops toss their badges to better battle an East Coast gangster turned West Coast “god,” played by Sean Penn — and it appears to be pitched somewhere in between “Casino” and “Who Framed Roger Rabit.” Camp this extravgant may be why the rest of the world hates America, but … U.S.A.! U.S.A.!