Supposedly they called the bomb squad 30 minutes before the explosion, but they hadn't managed to arrive yet. You know, you've gotta finish your coffee, find your favorite pair of diagonal cutting pliers, find the right pair of socks for the occasion, find the damn keys for the truck, and fight your way through the tough traffic at that hour. Not to mention, waiting on good ol' Leroy to finally show up so you can all leave. He's the only one who remembers whether it's red wire or blue wire so definitely have to wait on him. And the cop with the bodycam felt confident enough to stroll right past that RV blaring its warning (supposedly, I don't know actual source) without changing his stride at all or even turning to look, just not worth even a look don'cha know.