Please note the definition of "Theory" as it pertains to science. I feel you're using the term in the improper (lay person) context.<quoted text>
The scientific method does not try to explain things that cannot be demonstrated by reproducing the action.
Evolution is a THEORY because you cannot create an experiment for it to happen in a reasonable time frame.. Quantum mechanics is a THEORY because there is no way to observe its actions directly. They are both reasoned out to the most observable measurement then, gathering all of the before and after evidence, demonstrated to be consistently predictable phenomenon according to the theories.
Sorry. Modern science isn't living in the days before the Enlightenment. As I've said to others already, "WE DO NOT HAVE TO PROVE A NEGATIVE!!!" "Occam's Razor" is a subjective concept. Any theory IS by its very nature.
The lay definition of "Theory" is little more than a guess, the SCIENTIFIC definition is much more than that:
A scientific theory is "a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment." Scientists create scientific theories from hypotheses that have been corroborated through the scientific method, then gather evidence to test their accuracy. As with all forms of scientific knowledge, scientific theories are inductive in nature and do not make apodictic propositions; instead, they aim for predictive and explanatory force.