Why is Broad-Minded a Quirk?

[Ulzgoroth]

Originally Posted by Figleaf23

One that liberates a character from normal levels of narrow-mindedness.

There is no such thing as normal levels of narrow-mindedness for a PC. So being liberated from them is a no-op. A PC's thoughts and choices are constrained only by their disadvantages. If you don't have any disadvantages making you narrow-minded, you're not in any way obliged to be.