'decrease violence' is correct and usable in written English.
You can use it to call for a reduction in violent acts, such as in an essay about gun control: "We must decrease violence in our society by enacting stricter gun control laws."
What do you think is the best way to decrease violence related to drugs and the war on drugs?
The Americans welcomed the turnabout, which has helped decrease violence throughout the country, but they were not prepared for it.
A year after Gray's death, they say they are still using the truce formed that day to decrease violence.
The argument also regurgitates the same old disproven beliefs about crime, saying that stricter gun laws would decrease violence.
After an unusually fierce Taliban campaign through the winter, many worry that if it is not persuaded to decrease violence, this year could be the most challenging yet for the Afghan security forces.
Perhaps the most careful inquiry into whether supermax prisons decrease violence and disorder was a 2003 analysis examining the experience in three states Arizona, Illinois, and Minnesota following the opening of their supermax prisons.
At first blush, it appears to have succeeded in decreasing violence.
"The adjustment in the strategy is to focus on decreasing violence.
The violence was concentrated in Mansour, an upper-class area where residents had recently begun to emerge from house-bound hibernation as a result of decreased violence.
Several people said they were certain that the trend of decreasing violence cited by General Petraeus would reverse itself as soon as the Americans left.
"We do not assess we are in a trend of peace; we are in a trend of decreasing violence," he said.
