In media in general, and media with children in the demographic in particular, nothing is more dangerous or deadly than an old-fashioned gun. Guns have Instant Death Bullets, and those are the only things likely to cause instant death.
Knives, swords, arrows, etc., can hit square-on but leave flesh wounds that cause little more trouble than paper cuts. Blunt weapons may just bruise, if that, even when they hit. Lasers are often Family-Friendly Firearms that just stun, or leave burns with little more effect than a burn from a hot stove. Bombs sometimes leave just a soot layer on their targets; more realistic works will let a character Outrun the Fireball. If a building falls on top of a character, he may crawl out of the rubble with nothing more than a layer of gray dust -- yes, even in works that are superficially realistic. Tornadoes will just fling a character aside even if he does touch the funnel cloud, and Convection, Schmonvection gives enough protection from fire that almost anyone can escape it. Poisonous gas has antidotes, and the worst effects can be escaped if you hold your breath as soon as you know it's there. Even the radiation from a nuclear bomb, the other scariest weapon a character is likely to run into, sometimes causes beneficial mutations; even when it doesn't, it often leaves few side effects between the radiation poisoning and death.
But old-fashioned guns? If a bullet hits, even the overly minor flesh wounds are gonna hurt like mad. No one just shrugs off bullets. And if a bullet hits in a place that looks deadly, then it will kill, painfully. There may be time for a Final Speech, but usually not for an ambulance.