1- I believe gun violence is a huge problem in multiple ways. There are many situations where mass gun shootings happened as well as suicides that were from the use of guns. 

2- I believe racism is another thing. People are violently hurt and abused because of their race. It is a non human thing. For example some cops kill a specific race because they are being racist to them. 

3- sex traficking is also another thing.

4- Immigration