I don't know why greed is suddenly to blame. I would think Greed as a human sin would remain constant, unless there is a reason for otherwise. Didn't gas prices

I don't know why greed is suddenly to blame. I would think Greed as a human sin would remain constant, unless there is a reason for otherwise. Didn't gas prices go down in March and April 2020? why didn't oil companies act greedy and maintain normal prices as supply remained constant and demand plummeted?