system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] what are the goals of the sinestro corps?

sinestro was one of the greatest green lanterns before he turned evil and founded his own corps.

but...why did he want to start a corp of his own? is the goal to abolish the green lantern corps? to kill hal jordan? its said that the sinestro corps. "deliver order via fear" but when have they EVER delievered order? are they an actual enforcer group like the green lanterns or are just purely evil?
gpt
Sinestro made the corp for two reasons. One is internal, and a reflection of his emotional needs. The other is external, and is what he would tell anyone he asked. 

As you probably know, Sinestro was kicked from the corp when it was revealed he was using the power of his ring to enforce an authoritarian order on his sector of the galaxy. He believed (and this is the fundamental disagreement between him and the guardians) that fear was the most effective means of ensuring order in the universe. His switch to the yellow ring was both a reflection of this (he truly believes that fear is better than will) and an attempt to prove this to himself/the galaxy/the guardians. In many ways, his formation of the yellow corp is an attempt to win an argument with the guardians and get them to finally admit he was right. He want them to validate his worldview, as despite his hate he still has a lot of respect for them. 

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At the same time, his desire to bring order to the universe has never really abated. In this sense, the yellow lantern corp is merely a tool he has created to further this goal. And he truly *does* believe it is the best tool for that goal. To that end, Sinestro is alternately attempting to conquer the galaxy (as he did his own sector) and replace the Green Lantern Corp as the main police of the galaxy (and given how he policed his sector, this would be indistinguishable from conquering it). 

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So yeah, the corp is partly an attempt to conquer the world, and partly an attempt to show his dads he was right and get them to validate his life choices.