这胡乱一枪就要了一个无辜孩子的命。

An innocent child's life has been snuffed out by this senseless shooting.

《牛津词典》

也许整个问题中最令人担忧的部分是，另一个无辜的群体因为少数人的行为而受到惩罚并深受困扰的例子。

What is most worrying about the whole problem is, perhaps, that it is yet another instance of the innocent majority being penalized and inconvenienced because of the actions of a small minority.

youdao

万一你真的将一个无辜的人送上了被告席可怎么办呢？

What about the odd chance that you do put an innocent man in the dock?

《柯林斯英汉双解大词典》

People thought it was just wrong, categorically wrong, to kill a person, an innocent person, even for the sake of saving five lives.

他们认为杀掉一个无辜的人，是绝对错误的，哪怕是为了拯救五条生命。

耶鲁公开课 - 公正课程节选