Why say 「いるわけ」when わけ isn't an animate object?


From the first episode of _Death Note_ :

> この世に不必要な人間を消すことのできるヤツがいるか？
>
> **いる** わけがない

Why is いる used here, when わけ ("reasoning") isn't an animate object? Shouldn't
this be "ある訳" instead?




This sentence is an answer to the one right before.

> （～ことのできるヤツが）いるわけがない。"There cannot be (a guy who can...)"

Therefore the subject of the verb いる in this context is 「不必要な人間を消すことのできるヤツ」,
which is animate.




This sentence is an answer to the one right before.

> （～ことのできるヤツが）いるわけがない。"There cannot be (a guy who can...)"

Therefore the subject of the verb いる in this context is 「不必要な人間を消すことのできるヤツ」,
which is animate.

