Why does the Geneva Convention forbid medics from carrying any more than the most basic of self-defense weapons?

Question

Why does the Geneva Convention forbid medics from carrying any more than the most basic of self-defense weapons?

In: 10147

Answer 1

Because it also forbids medics from being shot. Therefore there should be no situation where they need to defend themselves.

Additionally because of this ruling all militaries would just start dressing all soldiers as medics to trick their enemies then ambushing them.