Let's forget what we've invested; a Google Forms survey is not enough to explain identity document verification behaviors; it's a description, not a cause. If we hadn't already relied on this data collection method, would we still claim that it demonstrates the underlying motivation of travelers? Without specific questions about why people verify their documents so early, we only observe a fact, not possess its reason. For example, knowing that 75% of Londoners use the metro does not explain why they use it instead of taking the bus or walking.