I agree cheap oil is good. However crashes are bad. Why do you think the price of oil is getting lower?
As I said, although in general low oil prices are good for complex economies, IF the cause of the oil price collapse is the collapse of the underlying demand — because of a recession or worse — then that is bad news.
I don’t know the cause of the current collapse. Hopefully it’s just Saudi Arabia making a play for long-term control of the oil markets. Hopefully it’s not fundamental economic weakness (though that is a strong possibility).