The reason worth the rhyme?

（どうやったら理由に意味を持たせられるんだい？）
　映画「チキ・チキ・バン・バン」[Chitty Chitty Bang Bang]の中で発明家ポッツが、２人の子どもたちに歌う歌「You Two」の歌詞より。「何が闘いに闘うだけの価値を持たせる？／何が山に登る価値を与えるんだい？／質問に答える価値があるのはなぜ？」というつぶやきに続いてのセリフ（歌詞）。「その答えは僕には簡単。大切な君たちがいるからだ」と続く。

• この部分だけすごくわかりにくいんだけど、実は "rhyme or reason" という成句があって、それをもじった表現。だから日本語にうまく訳すのは難しい。直前までの歌詞が「What makes ○○○ worth ○○○」続きなので、それに即して訳したけど、もっと単純にWhat is が省略されてると考えて「意味のある理由って何？」ってニュアンスかも。
• "rhyme or reason"は疑問文や否定文で使われる表現で「道理、分別、根拠」（a good reason or explanation for something）など。"no rhyme or reason"となれば「まともな理屈なしで、理由なく」（no sensible reason or organization／if there is no rhyme or reason why something happens, there is no obvious explanation for it）という意味になる。
  • There seems to be no rhyme or reason for the school's behaviour.
  • There seems to be no rhyme or reason to/for some of the things he does.
  • She does things without rhyme or reason.
  • Suddenly, without rhyme or reason, his mood changed.
  • There seems to be neither rhyme nor reason to Gerald's filing system.
  • The novel's plot had neither rhyme nor reason.
  • The teacher said my report was disorganized. My paragraphs seemed to be without rhyme or reason.
  • Everything you do seems to be without rhyme or reason.
  • I don't know what makes her behave like that. There's no rhyme or reason to it.
  • Because the cave was formed by gases that ate away the rock, there seems to be no rhyme or reason to its shape.