I personally don't like to use fingerprint.There are any dangers and potential issues when you use fingerprint as a protection.
I don't see any danger in using a fingerprint as additional layer of protection, why would that be dangerous?
Sometime 'more secure, less comfortable', protection with biometrics will certainly provide a double level of security. However, biometrics on the other hand is very sensitive to changes, for example when we experience injuries and there are changes to our fingerprints, it can be that this method will not work optimally. Just opinion.
Thats true,nothing is 100% safe, but i still think that we are going in right direction when it comes to security,its still better than just password protection.