One of the interesting laws concerning Hanukkah candles is that they must be placed no higher than approximately 35 feet off the ground so that they might be seen by passersby.
The core reason for candle lighting on Hanukah is pirsumei nisa/publicizing the miracle. The miracle, as the Rabbis understood it, was that one cruse of pure oil was found after the Temple had been defiled, and that cruse burned eight days until fresh pure oil could be made.
The possibility that purity can remain amongst the impurity of the world, that righteousness can stand even through the onslaught of injustice, that good can remain in a world that sometimes seems to be more and more evil—this is the miracle of Hanukah. The obligation then is to announce that miracle to the world. It must be seen in the streets. It is not enough to support justice loudly behind closed doors. One has to demonstrate justice and demonstrate for justice at street level. So it can be seen, and heard, and felt.