As a percentage, forklifts always way more incidents, and the incidents they can cause are BAD.

An F-150 isn't gonna make a warehouse's worth of product domino onto workers because someone leaned on the wrong lever.

I would like to introduce you to the concept for kinetic energy. Force=Mass*Acceleration

A very heavy object moving at slow speeds can easily have the same energy or more as a lighter object going moderately fast.

Forklift accidents also typically involve unsecured loads rather than just a collision between two objects. The collision is often an instigating factor that causes a poorly secured loads to fall and injure either the driver or a passerby.