Many leaders are too sure of themselves and think that they know what is right for every situation or person on their team. You may have observed a leader with this mindset as they have ignored reports and analyses and dismissed them as missing the point, or not "on the mark" in a particular situation or circumstance. While in some situations leaders can still be successful while ignoring the facts, it is not recommended that this become their routine practice.
As you lead people on your team in your workplace, community or social setting, take advantage of the different tools available to you and use them appropriately. Never underestimate the value of solid data and hard research.