It serves him right, he shouldn't have broken the rules.

该，谁叫他不守纪律。

《新英汉大辞典》

Yes, it serves him right.

是啊，他是活该。

youdao

When we use a phrase like 'it serves him right', we are, in part, admitting that a certain set of circumstances has enabled justice to act of its own accord.

当我们说“他罪有应得”这句话的时候，我们部分承认了某种特定的环境使得正义自动地起了作用。

youdao