https://www.gov.uk/guidance/be-open-and-use-open-source
"(i) The continuous and broad peer-review enabled by publicly available source code supports software reliability and security efforts through the identification and elimination of defects that might otherwise go unrecognized by a more limited core development team. "
https://dodcio.defense.gov/Portals/0/Documents/FOSS/2009OSS.pdf