The absent are always at fault.

The proverb points to a tendency to assign blame to people who are absent, especially when they cannot answer an accusation or offer their account.

It is a wry criticism of that habit, not a claim that absent people are genuinely responsible for whatever went wrong.

Use it when a conversation shifts responsibility onto someone who is not there to respond. It can gently challenge an accusation without asserting that the absent person is innocent.