It's early in the news cycle on this story, so everything stated here may be subject to new information as it becomes available, but from what we know so far, the shooting in San Bernardino appears to be either a staged government false flag operation or an ISIS terrorist attack.
From what we know so far, this does not resemble in any way a "lone gunman" or an angry gun owner targeting someone he hates. The attack took place at the Inland Regional Center, a company that helps disabled people improve their lives with training, self-improvement counseling and more. No lone gunman shoots up a building full of disabled people.
UPDATE: We now know that LA police used the same building targeted in today's attack as a stage for active shooter drills carried out every month! As they police raid began, one staffer from inside the building actually tweeted, "drill started."
Read more: WHAT REALLY HAPPENED | The History The US Government HOPES You Never Learn! http://whatreallyhappened.com/#ixzz3tEX2hr2x

Realist - Everybody in America is soft, and hates conflict. The cure for this, both in politics and social life, is the same -- hardihood. Give them raw truth.