Why is it necessary to ha e substantiated opinions in order for an argument to be effective?

How does the author of finding flight incorporate ideas from the poem hope is the only thing with feathers into her work

2.she could not believe the such a vile act would be committed .

Read this expert from herman melville’s the lightning rod man which contains a mythological allusion mr. jupiter tonans i am not accustom to be commanded in my own house call me now by the paga name you are profane in this time of terror which of these statements best conveys the meaning of the illusion