Indiscriminate murder would be one thing if with 〜ならともかく
Grammar Explanation: It might be one thing if with 〜ならともかく

Sonoko is invited to a band’s after party. During the get-together, the band’s singer Tatsuya eats a rice ball only to collapse and die. The police are called in, and Inspector Megure discovers the victim was poisoned. He accuses the man who prepared the food, but Conan bites into a rice ball to show it’s safe. The victim’s manager, Mari, agrees.
- 麻理:
- 「無差別殺人ならともかく、たまたま達也が食べたオニギリだけに、あらかじめ毒を仕込むのは不可能じゃありません?」
- “If it were indiscriminate murder, that's one thing but since it was just the rice ball Tatsuya happened to eat, wouldn't it be impossible to poison it beforehand?”
- 目暮:
- 「た、確かにそうだが…」
- “Th-that's true.”
The grammar ならともかく conveys that poisoning one rice ball is reasonable in the case of indiscriminate murder, but it’s an unreasonable method for a targeted murder.