We can't have hero's without villains/monsters. So I AGREE. Because hero's are only hero's because of the fact of us having monsters. Who would they face? Nothing? Then they wouldn't be hero's. We need bad things /people to have HERO'S to save and help us otherwise if everything was perfect, we wouldn't need hero's.
Phrases such as “while I lived” and “the grace, the beauty, the poetry” indicate most about the narrator’s feelings <em>that Twain was disappointed by his new feelings about the river.
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When he says “While I lived” He referrers to the time he had spent in the river, the adventures, the excitement.
The grace, the poetry, the beauty describes the way the narrator has always seen the river, as a magnificent scenario full of life and susprises. A place where he has lived his most amazing adventures
B. Traverse
Normally, a speaker would use the word "move" as in "move forward" instead of "traverse forward"