Yes and no.
The numbers may have been declining, but that trend may now be in reverse with the genocidal violence taking place in the ME and Obama important all those illegals, as well as hardcore Islamacists in various points of the country.
Possibly. Though numbers I’ve seen indicate that people killed by violence of all types has dropped off greatly since WWII.
Even the 20th century, widely spoken of as the most violent in history, isn’t really. Possibly it is if you consider only the raw numbers killed violently. But that is of course from a much larger population. As a percentage the 20th probably isn’t even in the running.
For the last 2000+ years China has had a cycle of dynasties collapsing and eventually a new one taking over. During this period the population usually crashed by anything from 25% to 75%. The percentage killed by the commies was actually much below that.
Germany probably lost less than 10% of its population during WWII. During the 30 Years War of the 17th century, it is generally estimated the German states lost 25% to 40%. Some regions never really recovered completely.
We consider the world of today and the recent past to be terribly violent mostly because we don’t realize what it was like in the more distant past.
It’s estimated about 8M people live in the territory controlled by ISIS, and that ISIS has killed something like 170,000 people.
That’s somewhere around 2% at this point. Way, way below the percentage killed by the Khmer Rouge. The Rwanda genocide killed around 800,000 people, from a population about the same size as that of the Islamic State.