With hindsight it is easy to say they should not have released him.
事后才说他们本不应该释放他,这倒容易。
📖 牛津释义
hindsight
n[U]
wisdom about an event after it has occurred 事後的觉悟; 事後的聪明
We failed, and with (the benefit of) hindsight I now see where we went wrong. 我们失利了, 事後一想, 我终於明白了错在哪里. Cf 参看 foresight.