Those really are two separate issues though.
I would say your claim that they ignore gang violence is wrong. The left wants to solve gang violence too.
Based on my decades of observation, the Left SAYS they want to, and will, solve all kinds of problems -- including crime -- but they rarely, if ever, do.
If they solved all those problems, what would they have left to run their campaign on? "Orange man bad?"
Nope. Drugs, crime, gangs, violence against the population, burglaries, theft, vagrancy, and high taxes. These are the diseases of the Democrat-controlled cities that never go away, because #1 they are very difficult to solve, and #2 the issues tend to attract voters, so the Dems NEED these problems to stay in power. How can you promise to solve gang violence if someone already solved it?
Instead, we get Dems pushing back against Republican solutions as racist or too expensive. Meanwhile, people continue to die.
Keep letting the law breakers out of jail, and this is the result. Take them off the streets, and you at least reduce the amount of crime, if not solve it completely.
As for gang violence, there's a fix for that: economic opportunity. Unless these Dem-run cities can help provide that, the gangs will remain "employment opportunities".