Why kill Pete?, Reivew on The Talented Mr. Ripley

At the end of the film, Ripley and Petter travel, but on the boat they meet Meredith who thinks he is Dick. According to the previous way, Ripley should kill Meredith, so that no one will know anymore. He used to pretend to be Dick, so he could use Ripley's identity with Petter, who loved him so much.
But if you don't kill Meredith, why kill Petter? Killing Petter is useless. In Petter's eyes, he is a completely innocent Ripley.
Ripley can no longer be Dick, Dick has committed suicide, if Dick didn't commit suicide and then ran out to kill, this lot of trouble could not help but come back. So Ripley can only survive as Ripley now, he doesn't need or want Dick anymore. In that case, why not kill Meredith, but kill Petter? seek analysis

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