As happens with all mass shootings, authorities and pundits in the Fort Hood slayings this week have begun to ask how such a tragedy could occur.
Army Spc. Ivan Lopez, 34, killed three people and wounded 16 others before fatally shooting himself. The native of Puerto Rico struggled with mental illness and was on medication to relieve depression, anxiety and insomnia.
It is impossible to know what may trigger a law-abiding gun owner to suddenly open fire on innocent people. Such questions should prompt lawmakers in states, municipalities and Congress to toughen gun laws.
Inaction only ensure that such tragedies will keep occurring.