The actual name of this poem by W.H. Auden is "Funeral Blues." The poem was actually first written as a parody of another poem written to commemorate the death of a politician.
If you take the poem at face value, you can see it as a very moving description of how desolate the death of a loved one can make a person.
In the poem, the speaker is listing all the things that he thinks should be made to mourn -- all the ways in which he wishes the dead person to be remembered. He ends by saying that all good things may as well be destroyed because all that was good has died along with this person.