""Oh well, each to their own realities I suppose.""

True. One can have comfort in holding their own realities. This comfort zone can even be successfully shared with like thinking people.

However, when these personal realities are brought forward publicly (such as in a discussion forum) to build and promote a case and a conclusion, they face the scrutiny of a wider audience. The logical validity of the case and the conclusion it presents is most often determined by whether it is built on sound foundation, or is based on shaky ground and good old "happenstance".