The answer is that people are crazy with fears, traditional bullshit, and irrational thoughts pretty much all the time. The planets have nothing to do with it. Then why, you may ask, does the moon have a gravitational effect on tides? Tides affect oceans – 80% of the earth’s surface – every day of the year. NOW we’re talking some planet-to-planet strength! But even this force does not cause large water flows in smaller bodies of water like the Great Lakes.
There’s never been an accepted scientific study proving the moon has any relationship to “loonies” (even though that term comes from ‘lunar’).
“Moonies Make People Crazy”
It’s been estimated that over 15,000 people per year “moon” Amtrak trains across the country. And there’s a small town in Southern California that celebrates a “Moon Amtrak Festival”.