The poem, set in Vietnam, describes the damage the chemicals are inflicting on the people. The chemical agents are described as "omnipotent" - unlimited power, and indifferent to who is affected, as if it was God himself. It causes "illnesses, birth defects and premature deaths"
The author deliberately chooses words with a strong impact. He describes the mixture of chemical agents as a potpourri, a mixture of fragrant plants material. In this case, a deadly concoction of poisons. Using the words "nefariously and deceit" his personal opinion of the Vietnam War is the means used to carry it out were unjustifiable
My personal opinion of this poem is that it quite accurately describes the front line conditions of the Vietnam war. Innocent civilians are shot, bombed and poisoned. The Communist activities are disrupted but not halted. A waste of resources for the US government that brought the world no further from Communism, instead rallying support for it. It is also true that future generation, American or Vietnamese, would be affected by Agent Orange by birth defects.
Television brought the brutality of war into the comfort of the living room. Vietnam was lost in the living rooms of America--not on the battlefields of Vietnam.
--Marshall McLuhan, 1975