I mean Guy was pretty pissed off, and earlier in the issue a bucnh of scared people are yellow for fear.
Which is my point exactly. Getting a red ring is a death sentence, and not a voluntary one like whatever the cost of the blue rings is. Red Lanterns are mindless, blood-vomiting rage machines, pure evil malignancy; the red energy isn't just "harder to control" because it's further from the center, it outright takes over, completely replacing the victim's personality and individual mind with predatory madness. Nobody moral or white-hat inclined ever gets targeted for a Sinestro ring and goes "I will use this power to fight evil." Fear and anger are officially evil, according to Blackest Night.
Which is crap, utterly and completely. Using fear as a weapon is not unique to bad guys. Bruce is not a special snowflake in that respect, and while it makes sense for him to reject the ring, it makes no sense that he's the only sentient in the galaxy with any moral character who was presented that opportunity. Green Lanterns go bad, where are the Yellow Lanterns who've gone good? If anger is so evil and overpowering, why is somebody as angry as Guy, or again, somebody as angry as Bruce, able to use that anger constructively?
It's just so simplistic and boring. "Oooh, look, anger makes you an animal." Thanks, guys, great insight, but Marvel's had that pretty covered for about as long as comics have been around already, and as fun as Ruffles the Rage Kitty is as a meme, a faceless mass of blood-vomiting nutcases just don't carry the same impact as a single Bruce Banner who we can get to know and who's actually a person, struggling with that anger.