A restatement of the thesis.
Rational and logical are quite similar in meaning but rational is something that has logic. These two words are close synonyms and not antonyms.
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"Grass" is actually a poem that was written by Carl Sandburg. This is a poem in which he has published right after the World War I which is in the year 1918. Based on this poem, you can sense an unforgiving tone in it. Therefore, I can say that the attitude that the author expresses is "anger". Hope this answer helps.
