The reason there aren't as many knife attacks in the U.S. is because the mental cases and bad guys have a gun.In China, where guns are less prevalent, the nut jobs use a knife.
Wack jobs killing people doesnt matter to them if they are killing with a gun, knife , a vehicle or poison.
Fixing mental health issues will greatly reduce mass killings. It won't stop the inner city gang activity in Chicago, LA, or N.Y. What would reduce the inner city problem would be a more visible Police presence along with responsible and capable politicians. That won't happen until Republican leadership is in place in those cities. That won't ever happen in Chicago so politicians like Bettlejuice will continue to be part of the problem.