Let's get the biggest thing out of the way first: Dragin Ball Z is one cartoon that's not afraid to kill people off. In fact, its obvious fascination with death has led to mass genocide on more than one occasion. Stars, planets, and entire races have been wiped from existence
in a blink of an eye without a second thought.
The first taste of on-screen annihilation comes at the hands of Vegeta, who blows away a fully inhabited planet while on his way to Earth. Even more disturbing is when Frieza decides to wipe out the entire planet of Saiyans, as we're forced to watch the many citizens scream and stare down their fate in the form of a giant fireball.
Sure, it's not exactly Hotel Rwanda, but these moments are still pretty brutal for a cartoon show that features talking dogs and cats as comic relief.