Generally, punches and kicks are seen as the most dangerous since it sounds so brutal. While punches and kicks can be deadly, there is perhaps nothing more dangerous than a slam that causes a person to land on their head or neck. Because the ground is so heavy, all the energy generated from falling on the ground is going to be transferred to the head as the ground is technically immobile. This is especially deadly if the material is something like concrete.
In addition, a person’s body is heavy. Landing on the neck can potentially break it, leading to death or paralysis. The danger from strikes comes from potentially getting knocked out and falling on the head. Slamming can drop a person on their head with much more force than falling.