Some people never mature it seems. Maturity is the ability to understand, have wisdom and when a person is prejudice he is not understanding
People who reject or hurt significantly another person on purpose is not wise and is considered immature. Those who continue to be violent and or corrupt have to open their hearts and minds or will be rightly dealt with to stop their advancements.
John Michael Levesque commented
Nothing that is physical or what is made is absolutely perfect. Until that day comes, that which is imperfect is made perfect will always need to remember how awful human kind has proven itself even usually in the depths of the heart.