He destroys her flowers
Jem is so angry about the comments Mrs. Dubose made about Atticus being no better than 'the people' he is defending, that the takes Scout's baton and ruins all of her flower bushes. He does this out of anger and impulse, trying to defend the name of his father and his family.
It is not an effective thing to create change in society. Yes it may work, but it can cause riots and things of that sort. A change caused by fear is not efficient. (Im sorry I don’t have time to get some examples, I’m leaving rn.)
Well "universe of obligation" is when you are neighborly and help each other out. But in the South the "universe if obligation" is simply being Christian. So basically they treat people the way they would want to be treated. Since Miss. Maudie is a lonely woman and is basically helpless, people feel as if they should help someone like her.