I want to know how the shooting in San Bernardino could have bee

Wildwood - I want to know how the shooting in San Bernardino could have been prevented if guns were illegal? France has extremely strict gun laws, yet terrorists mowed down innocent people with assault rifles firing on 'full automatic.' Did the California shooters have any regard for any law, and did they buy the guns legally? We have a horribly-damaged society in a horribly-damaged world. There is no honor, no rule of law nor regard for life. Morality is twisted or disregarded. The rights of the mad outweigh those of the sane. Someone tell me how banning guns would have stopped this?