But how are you suppose to know if the "theory" is valid or not unless you've illuminated every possibility that could potentially make the thoery invalid? The only way for you to be able to illuminate those possibilities is to be skeptical of the theory itself and seek out and investigate those possibilities.
Some of us do that with the Biblical supernatural. We cite scores of unique fulfilled prophecy, all supernatual stuff, and you all simply pshaw it as if it didn't exist. Why? Because it throws a big monkey wrench into the cogs of your secularist machinery.
Witches, pagans, spiritualists and Biblicalists, wizzards and seers, the good and the evil all work with the supernatural. Unless you're one of these, you will may not be aware of the spiritual entities and principalities existing in the universe. These entities do not make a point of demonstrating for the sake of entertaining unbelievers. Why should they waste their time, when you don't believe what we
are able show you anyhow?