The people who built the pyramids wrote down why they built them
You bring certitude to a subject where certitude does not exist. Now, if you would care to spell out word for word what is written in all those hieroglyphics, feel free. But don’t adopt the audacity to assert everyone knows how and why the great pyramids were built, because even experts in hieroglyphics disagree on their meaning. By the way, I doubt they were built by Joseph for grain storage, but find it distasteful to mock someone who holds to that theory.