Is also great (line 8)
Here "great" means "huge," "pervasive," and "powerful," not, "fantastic." Still, "great" is an interesting word because it has no negative connotations – another sign of the absence of fear in the poem.
And would suffice. (line 9)
This ending is like something you might hear from an exterminator who thinks that the way to solve your pest problem is by blowing up the house. That's called ironic understatement, folks.