Err...that's not actually what theory has to do in science.<quoted text>
Why do elements not evolve?
Oxygen has always been oxygen, right?
Carbon has always been carbon, right?
Water has always been water...
Every life on Earth is made of elements & are thought to have evolved. Why hasn't elements evolved?
Elements don't evolve because they don't reproduce. Evolution is about change - you need something that can change to have evolution. You need to have a system that includes 1) reproduction, 2) inheritable traits, 3) variation of those traits, and 3) limited resources to have evolution.
If you're missing any of those, you simply do not have a system with evolution in it.