The text message arrived at 12:44 a.m. We were asleep, but Holly heard the ping. Messages after midnight are almost always bad news. “You guys are going to wake up to news of another mass shooting. Don’t watch the video.” The warning came from Jackson Gilbert, our youngest son who will graduate in May from a police academy. Jackson wasn’t simply trying to protect us from seeing a gruesome massacre. No, it soon became clear that the slaughter of dozens …