There are innumerable ideas concerning the nature of reality. One school of thought is that the existence of anything DOES depend on whether or not they are believed in. Who knows, maybe even the vast right wing conspiracy actually exists in Hillary’s world.
This reminds me of the classic question, "if a tree falls in the forest and no one hears it, does it make a sound?"
The tree falls, thus making a traveling wave (an oscillation of pressure) in the atmosphere. Since this is the definition of a sound, the answer is an unequivocal "yes". When I said as much to my teacher in Philosophy 101 he didn't like my answer, which made me more confident that I was right.