Before the emergence of COVID-19, the National Academy of Medicine had provided guidance on the reallocation of scarce medical resources – including ventilators – during extreme situations. Based on focus groups and key informant interviews conducted in 2018, this study sought to understand potential barriers arising from ethical conflicts to the implementation of these guidelines for ventilator allocation in the event of resource scarcity. Participants anticipated challenges reconciling this protocol with their roles and identities as health care providers, as well as concerns about emotional consequences, and fear of legal repercussions. These concerns raise questions about the performance of such a protocol in disaster scenarios and highlight the need for disaster preparedness drills and training.