The underlined words in this excerpt from Muriel Ruckeyser's "Poem" suggest a tone.
hopelessly depressed
brightly exuberant
greatly distressed
cautiously optimistic

Not able to be decided

Please post the poem in the comments of this answer so I can actually give you an answer. I don't have sufficient information right now,

the answer is cautiously optimistic

Explanation:

i got it right on odyessey

the speech this question is referring to is president kennedy's special message to the congress on urgent national needs, may 25, 1961

kennedy responds in a very direct and concrete way to those thinking that communism is a positive system:

"yet their aggression is more often concealed than open. they have fired no missiles; and their troops are seldom seen. they send arms, agitators, aid, technicians and propaganda to every troubled area. but where fighting is required, it is usually done by others--by guerrillas striking at night, by assassins striking alone--assassins who have taken the lives of four thousand civil officers in the last twelve months in vietnam alone--by subversives and saboteurs and insurrectionists, who in some cases control whole areas inside of independent nations." (kennedy)

president kennedy presents communism as cowardly, as a hidden and treacherous weapon that strikes from the shadows like thieves, he represents the system as not even being capable of showing and open and overt attack or confrontation. to finish up the response, he expresses that the system attacks even a country's idependence and freedom.

the answer to the given question above would the one that wiesel is establishing and how is ethos by appeal to his authority in having survived the holocaust. hope this answers your question.

have a great day ahead!