With hindsight it is easy to say they should not have released him.
事后才說他們本不應該釋放他,這倒容易。
?? 牛津釋義
hindsight
n[U]
wisdom about an event after it has occurred 事後的覺悟; 事後的聰明
We failed, and with (the benefit of) hindsight I now see where we went wrong. 我們失利了, 事後一想, 我終於明白了錯在哪里. Cf 參看 foresight.