What is more important here isn’t the act of taking your biometrics, but the purpose of taking them — what the biometrics will be used for. In her case, I’m sure the database she’s going to be ‘filed’ in is that of people who actually did something to be in there — people who are actually a threat to security. Once you’re there , that’s what you will be perceived and judged as , and you would , as she will, have to travel with explanations and justifications of why you aren’t what the record says you are. She did nothing to deserve being in that cooler, or getting the treatment she got. Her bitterness isn’t about being denied entry, but the manner and the reasons for which she was denied entry. I’m pretty sure you would have different feelings about being taken into custody and having your biometrics taken after a misunderstanding with federal officers if it were under a drunk and disorderly charge, as opposed to a pedophile charge, especially in the case where you were not only innocent, but you were also denied any chance, hope and right to justice. I don’t want to assume that your perspective is that of a privileged and ‘law-abiding’ citizen, for if that is so, you will be surprised, shocked and humiliated if and when the system looks the other way and decides you are neither.