The word palliate is a verb that is used to refer to those actions by which it is sought to limit, reduce or combat certain phenomena or situations. Normally, the word alleviate is related to the search for an end to negative circumstances, such as when it is used to say that "we seek to alleviate world hunger".
According to common usage, the word palliate means to put an end to something or to fight against it. The term is recurrent in situations in which there is some foresight and preparation in the quest to put an end to what one wants to stop. In this sense, the term palliate is not common when something stops spontaneously or without anyone having generated it, for example when a streak of insecurity and violence ends. If it is ended by the planned and planned action of the corresponding actors, we can speak that they alleviated insecurity and violence, but not if it does not end in that way.
As said, the word is normally used to refer to situations or phenomena that are negative for daily life and that represent different types of dangers, threats or complications. Thus, we cannot say that "joy was sought to alleviate" since in this case we would not be talking about a negative or dangerous object. This is so because the notion of palliating means attacking, ending something that should not have been present for any reason. It is normal to find this term when talking about situations that are harmful to society, such as hunger, misery, illiteracy, different types of diseases, insecurity, etc. And in those cases, the action to alleviate is an action that always falls on the responsible officials and politicians.