You could add the tag 'will you?'. ;-)
Dear tdol thanks for an early reply.
If so the following statement should have a question tag "Let the convict be hanged to death".
What question tag can we use here.
As per my knowledge a question tag should justify a statement. It is used to confirm the statement but not to take the permission.
Kindly once again review your reply.
In this case I believe the same question tag should responsibility, obe used (in negative because the statement is affirmative).
The reason we use the future is because the original statement is an imperative, so it is something that is still to come.
In this case, the reason you find responsibility (not exactly permission) is because it is an imperative, and the person doing the action will be held responsible. But the speaker is also searching confirmation. An answer is expected (unless used sarcastically), because we don't know if this order will be followed or no.
Let the convict hang to death, won't you?
-No I won't let it happen.
-Yes, that's what he deserves.
Let him go, won't you?
-Of course not. He has responsibilities.
-Yes, I think I will.