The phrase "to damn the evidence" means to ignore or reject strong evidence that proves something because one does not want to accept the truth or make necessary changes. Full definition
Here's the most damning evidence of the Academy's Foreign Film dysfunction: Even the Golden Globes, famous for dysfunction and questionable ethics, are doing it better than they are. (theatlantic.com)
Reading through the trial notes, it's clear that the most damning evidence against Yupanki were letters detailing the conspiracy, written on paper in Spanish and found among his possessions. (scientificamerican.com)
Pretty damning evidence of how terrible the whole replay system was throughout the tournament. (diehardsport.com)