If this was really an act of terrorism, this would have to be one of the more bizarre targets someone could choose.
You can listen to the San Bernardino police scanner here:
http://www.broadcastify.com/listen/feed/12443/web
They have discussed multiple suspects—and continue to do so.
Remember the macabre joke making the rounds after the Achille Lauro?
Q. "How do you make a Leon Klinghoffer?" (mixed drink)
A. "Two shots and a splash."
They shot the guy in the wheelchair to emphasize that NOBODY could expect pity or mercy.
OR the Palestinian terrorist who shot the young girl's Dad in front of her, then bashed her brains out on the rocks?
OR the other Palestinian terrorist who killed most of an Israeli family, including the children, up close and personal with a knife?
Or that ISIS released a video of them machine-gunning roughly two hundred children?
Remember Beslan? Where they raped and/or murdered middle school age children in front of the others, including stabbing a 13-year-old in the gut, who just went to ask them for a cup of water?
And they booby trapped the school with explosives to foil rescuers.
Ask yourself...how come you never see "Coexist" stickers on cars coming out of mosques?