The gemara (Sotah 49b) states that one of the tragedies that will occur during the pre-Messianic era is that “the face of the generation will be like the face of a dog.”

The Chofetz Chaim explains in the name of R’ Yitzchak of Volozhin that if one throws a stone at a dog, it will pounce on the stone, not understanding that it wasn’t the stone that hit him, but rather the person who threw it. 

Similarly, people will blame various causes for their distress, failing to understand that everything comes from Hashem.