The stockpiling behaviors during the COVID-19 pandemic emerged as an example for situations where cooperation is inhibited by lack of trust, media exposure, and increased anxiety. In this paper, I test the hypothesis that stockpiling results from social psychological factors that prevent psychological groupness and cooperation (e.g., low trust in governments and other citizens, high frequency of news exposure, high pandemic anxiety), rather than being an inherently selfish and uncontrollable panic behavior. Specifically, I hypothesized that lower levels of satisfaction with the governments’ COVID-19 policies, lower trust in people in following physical distancing rules, and more frequent media exposure would predict higher stockpiling behaviors through increased pandemic-related anxiety. In a cross-sectional survey study conducted in Turkey and the UK during the first-wave of the pandemic (N = 5137), I tested a conceptual model via SEM. Findings showed that lower trust in people, lower satisfaction with governments’ COVID-19 policies, and high exposure to news predicted higher pandemic related anxiety which predicted higher stockpiling in both countries. I discussed that governments policies and media in both countries may be the reason for mass stockpiling behaviors by decreasing predictability and trust.