The phrase "mere fact" means that something is just a simple and straightforward piece of information or truth, without any additional or hidden meaning. Full definition
The basic rule is that there is no copyright protection in mere facts or ideas. (canadianlawyermag.com)
If most people believed in Unicorns, while compelling by mere fact of the numbers of people who believed it, would it make your lack of belief in it a «religion»? (religion.blogs.cnn.com)
If one can be a tribalist by mere fact of having a political persuasion, are we not all tribalists? (johnquiggin.com)