I hope you are right. If christianity is powerful to stop murders, then that would be a blessing. But there is a long way, because it seems tough to stop evil. It seems evil is rooted into the hearts of people.
Evil sure was rooted in the hearts of most people who lived at the time of Genesis 6:11.
In other words, there were more evil people than righteous people on Earth at that time frame.
If there would Not be coming divine involvement in mankind's affairs that would be a long way.
As the days were cut short for violent people to live at the time of Genesis chapter 6, so it will be again.
Not by any fiery destruction, nor by water, but by 'words'.
Not just any ' words ' but Scripture informs us by the ' executional words ' from Jesus' mouth - Isaiah 11:3-4
Jesus as King of God's Kingdom, and as Prince of Peace, will rid Earth of evil - Revelation 19:14-16.
There is a soon coming ' time of separation ' to take place on Earth as per Matthew 25:31-33,37,40.
Those who are past the point of repenting are classed as haughty figurative ' goats ' to be destroyed.
As the end came 'hard and swift' back in Genesis, and for un-faithful Jerusalem in the year 70, so too the coming end of evil on Earth will also be hard and swift once the political world surprisingly turns on the corrupted religious world.