Ignorance of the law is no excuse 了解一下 他不應該不出庭 出庭可能就是告誡一下了事

不出庭是藐視法庭 是一個 offense。

https://educaloi.qc.ca/en/capsules/ignorance-of-the-law-is-no-excuse/#:~:text=There%27s%20an%20important%20legal%20principle,you%20were%20breaking%20the%20law.