Namimori

The second thing we learn about Hibari is his love for Namimori, both the school and the town. (The first thing was that he beats people up that he doesn't like xD) It is one of the biggest aspects of his character, his pride laid bare for everyone to see. He will defend the pride of Namimori against any foe or mistreatment - from something like someone plotting to destroy it or someone smoking in it. (i.e. Gokudera) He find sit insulting if a student even wears the uniform incorrectly, despite he himself not wearing it properly... ever. He even goes so far as to enforce the school rules on people who aren't even students there.

In the future arc, Hibari is obviously no longer a student at Namimori, but he hasn't let that stop him from defending it. Not only that, but he has extended the area he desires to protect to include the whole town, still enforcing his rules on everyone he deems to be breaking them. And no one says anything different, because he's a scary, scary person xD