How to disallow hiding own questions with children?

Question

Some users are hiding their questions after they are answered. I don't think that's fair to users who spent time answering and other people who might have the same question.

Comments

Totally! that feature should be disabled if the item (Question/answer) has children.

It's like a conversation:

Someone A tells another person B to jump off the bridge.
Person B jumps off, Someone A hides every trace of his words from the planet, camera, memory, etc.

Passerbys become even more puzzled as to why the fool jumped off in the first place.
And police investigation becomes a nightmare.

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Well said. Users should be able to hide content with no children. I edited the title.