Last week, this documentary series – with each installment dedicated to an analysis of recent mass shootings in the U.S. – premiered with the 2012 mass shooting at the suburban Colorado movie theater in Aurora, during the midnight Batman premiere of The Dark Knight Rises. Seventy people were shot in 90 seconds – which sounded like a horrendous amount of carnage. Then, on Sunday, the mass shooting in Las Vegas occurred, with the apparently lone gunman claiming, at recent count, 58 deaths and nearly 500 wounded. This series is well-researched, thoughtfully presented, and focuses with care on the victims, family members and friends, and first responders. But the fact that this series exists at all – and has a brand-new sequel already waiting to be made – is a sad, sad thing to contemplate. Tonight’s topic: The 2015 mass shooting in San Bernardino, in which a man and his wife opened fire during an all-day holiday party and training seminar, that left 14 dead and 22 wounded. Showtime announced this second episode would be televised as scheduled, even though a Monday repeat of last week’s show was pulled out of respect for breaking events in Las Vegas.