I think the more likely explanation is racism. If the pyramids were in Europe, nobody would challenge their human origin but pyramids are in Africa Surely aliens are involved.
This is such a weirdly misanthropic view of humanity. Why are people so desperate to find evil in this world when ignorance is not only nicer to believe, it’s insanely more accurate? Like I get it, you’re depressed, but this doesn’t automatically make everyone everywhere that doesn’t believe some random facts “racist”.
[0] https://www.smithsonianmag.com/history/how-white-southerners...