The opinion that it is real is also not a fact. We're not talking about physical things. They're made up rules about made up things. It can all be different if we agree to make it so.
IP isn't a concept that has existed in all cultures for all time. It's not inherent to group dynamics or humanity. It's not even a concept that's fully respected by cultures that claim to care about it.
I'd push even further and say it encroaches, if not outright invades the conversation about who owns what data. Both are terribly muddy waters, to be sure, but something worth hashing out since we live in an age of information that is both accessible and under threat, so the real question is where do we want to collectively steer this ship?