Robert Park, a U.S. Activist who crossed over the North Korean border armed only with a letter, and Laura Silsby, an American missionary to Haiti with a heart for orphans, are both great examples of good intentions gone awry. Check out their stories:

Robert Park (entering North Korea)
Robert Park (release from prison)
Laura Silsby

Proverbs 19:2 – Desire without knowledge is not good, and whoever makes haste with his feet misses his way.
Justin Kitchens