A thesis statement is generally the first few sentences of your writing to help get your readers interested in what they'll be reading. So, if your thesis is unclear, they'll be confused about what's going on before anything even happens.
It took it to the action of against racial injustice because there were more society .
"everything was suddenly out of tune like a broken accordion" is a good example of figurative language. It shows the knowledge of the narrator, who must have seen or heard this broken accordion at some point in his life. They seem in shock by the fact that his family is crumbling, hence their use of the word "suddenly." It also shows quite the dramatic persona and exaggeration by saying that 'everything' was suddenly out of tune.
They thought the Indians we're a big threat and would attack.