How to evaluate the movie "Defending the Wonder Man"? Why did dr. manhattan finally have to kill Rorschach?

This movie is very good, because Rorschach knows the secret, and he says he will make it public for the justice in his heart.

Because dr. manhattan sacrificed several people and saved the world, Rorschach didn't like it, so Rorschach wanted to reveal the secret, but then the world war would start again. ?

They don't compromise, so Rorschach must die. They insist on their own justice, just like lifeboats. Everyone can only be safe if one person is left behind. Rorschach chose not to give up anyone, while dr. manhattan chose to sacrifice a small number of people for everyone.

If Rorschach were still alive, he would make it clear to people that the nuclear explosion in new york was caused by what dr. manhattan did to prevent Russia and the United States from waging war. If no one says anything, the world will always mistakenly think that dr. manhattan killed Americans and treat Dr. Liu as a public enemy.

In order to keep the earth peaceful, the doctor would rather be misunderstood by the world than live on Mars. Rorschach is a persistent and fair person. If he doesn't speak out, he will suffer. If the doctor kills him, there will be no pain, and he will keep this secret forever.