Historical note on the book of Joel
It is thought to have been written somewhere between 500 and 850 years B.C.. They think Joel was a prophet, but he gives no information about himself in his book other than to tell us his father's name, Pethuel.
One thing he does tell us about is locusts. He says that when people are starving they will listen to God and that's why God sent the locusts to eat their crops and starve them - because God loves them.
It is not the only thing it says, but people go to war over bible interpretations. And they come up with such a wide range of them. For instance, in the 1500s a Dutch physician named Johannes Goropius Becanus concluded that the language spoken in the Garden of Eden was Flemish, in particular the Flemish dialect of Antwerp where he lived. People manage to find themselves to be righteous one way or the other. Even, or perhaps especially, physicians. Someone else can argue scripture with them. I am stopping here before someone goes to war with me about it.