At that point, the avenue was blocked. It is for this reason that the sages link Yisro's coming to the Jews with these two events. This is what generosity is all about. When we start acting generously, we have to break our cruelty and transform it into compassion. That is our service of generosity.
Some people are naturally compassionate, as a result of which they give charitably.
But that is not their service. There are, after all, animals that are also naturally compassionate. The service of generosity is to break our cruelty and turn it into compassion. I have commanded the ravens to feed you. The raven is naturally cruel.