Well for one thing you address the underlying cause of the suicides.  Frequently in murder suicide it's a change in family status (gf or husband cheats or wants a divorce) and one party can't or won't deal with it.   Other times it's loss of job and hopelessness surrounding ever finding another.    Either way liberal social policies make both of these scenarios worse.   As for the gang front.   Chicago has never truly tried to take on the gangs only to push them out of a few specific areas of the city.   They've succeeded at that.   They have succeeded in taking out gangs that threatened city leaders political power.   Gangs that stay out of that specific set of conditions are left virtually untouched.