• They were written by someone with interests antithetical to our own.
• They were not written by anyone we know and either:
  • We cannot examine them because
    • It is too expensive to do so
    • Proprietary rights preclude it
  • We cannot determine what they will do when we examine them because:
    • We are not smart enough.
    • They indeed have no principles that make them benign.
  • We do not have the tools to correct flaws that we discover.