Washington, DC/ Chicago Justice

Are current criminal laws enough to address the need for justice in Washington, DC and Chicago?
Recently in Washington DC, a military veteran who had access to a US Navy complex building went on a shooting rampage, killing 12 and then getting shot himself. Also in Chicago, which has the worst homicide rates, there was a shooting spree in a local park wounding 13, including a 3 year old boy. Unlike the shooting in the Navy complex building, the shootings in the park in Chicago could have been prevented. What parents would bring their 3 year old son to a park after dark? They knew that they lived in Chicago, notorious for violence, so they basically set themselves up for it. Although this is true, the shooter is still in the wrong. I don't think current criminal laws are enough to address the need for justice in this case because of the fact Chicago is so violent, something needs to change to lower the homicides rates. If laws don't start changing, these rates will never change.
The shooting spree in Washington, on the other hand, is a perfect example of why current laws aren't doing enough to keep people safe. I don't feel safe anywhere anymore because there are so many dangerous people who have guns. The families of the people who were shot by this criminal will never see justice because he was killed at the scene. More and more people are being killed by gun violence and nobody is making any productive moves to change the laws and serve justice.