Our God is a God of justice (Deut. 10:18) and is angered any time justice is not done. We likewise must be moved to work for justice, and being reminded that Rome did not deal with Jesus righteously should make us hate injustice all the more. We should be doing all we can to make sure justice is done, and some ways we can do so in our communities is by voting for honest judges and politicians and supporting ministries that work to extend justice to the unborn.
For further study:
The Bible in a year: