Let them decide. It’s ultimately their decision, so don’t begrudge them the power of choice. If they have an idea that takes them astray of your goals, let them go and see what’s there without any retribution or backlash. They are not being spiteful (unless they are) so don’t punish them for make a choice different than your expectations.
1. It is not a competition
2. A DM doesn’t win
3. It is just a game
4. We already know you are clever
5. We all agree dice are the guilty party.
6. Exalt them and exalt yourself.