Its healthy to always acknowledge the possibility but if there’s a mountain of evidence pointing one way
You’re assuming the fingerprint is perfect. It might not be. In enough cases they do not have the full fingerprint. Then if there’s a match, was it actually a match or not?
For above, this caused problems though times. Especially with huge fingerprint databases.
Disagree with your statement that there’s loads of evidence pointing that fingerprint are unique. That’s not how they’re used. And there’s enough cases where it went wrong.