✔ 最佳答案
1. "這"真的很荒謬,"為了假仁慈而不去殺一隻蟑螂". ("這"代表一般人做的那件事)
It is ridiculous to pardon a cockroach just to act like a benevolent person.
2. 這真的很荒謬,[他]為了假仁慈而不去殺一隻蟑螂.
It was ridiculous that he pardoned a cockroach just to act like a benevolent person.
(just to act like .. 正確是 扮作仁慈, 或可理解為假仁慈, 即假惺惺也! pretending)