This is so very sad. Had this gutless neighbor said something as he well should have, 14 more people would most likely be alive today. He let the ‘clock-boy effect’ screw up his sensibilities.
If you see something, say something. Don’t be a gutless, quivering worm who is afraid of hurting someone’s feelings. Screw their feelings. What if one of the victims was YOUR husband, or YOUR wife, or YOUR child? This mayhem CAN happen in YOUR neighborhood. Put the political correctness police on hold and be aware of your surroundings and if you see something that doesn’t make sense or looks suspicious, report it, even if anonymously.