It's hard to set your emotions aside when you're faced with a difficult decision. This is problematic, since our emotions often cause us to make the wrong decision in important areas of life, including in our relationships, our finances, and our health.
It will be perfect. Because not only will the hall itself be a bad decision, but anyone who ever attempts to visit it will clearly be making a bad decision as well. Inside the hall, we will have exhibits for all of the worst decisions ever made.
Imagine the director of a big company announcing an important decision and justifying it with it being based on a gut feeling. This would be met with disbelief - surely important decisions have to be thought over carefully, deliberately and rationally?