system
Given the following post, respond as if you're commenting on Reddit:
human
[DC Comics] Why did the Guardians think Sinestro stood a chance against Hal Jordan who had just taken at least 30 GL rings in Emerald Twilight?

This boggles me. After he tried to recreate Coast City after Mongul and Cyborg Superman destroyed it he went to Oa and took at least 30 Green lanterns power rings and its well known that Hal is stronger than Sinestro and has beaten him on multiple occasions but somehow the Guardians thought an even more ruthless Hal Jordan was going to be stopped by Sinestro?
gpt
The other Green Lanterns were trained to be Green Lanterns, and that meant they had been taught to hold back; at that point in time, it was forbidden for a Green Lantern to kill.

Sinestro wasn't going to hold back. Yes, Hal had beaten him before, but there were no other options. The Guardians were using their last, desperate gambit to stop their most powerful weapon.