Reduced? Alcohol consumption is down (depending on how you view the stats), but drugs are winning the War on Drugs. Everyone else is losing. Legally, oxycontin is more highly regulated today, but the opoid epidemic is, well, an epidemic. Cannabis is legal for recreational use in many states. I willing to buy that something that's widely available in today's society has lead to less war (Internet porn, perhaps?), but I'd be surprised to hear in what ways drug use is down.

> but drugs are winning the War on Drugs

Drugs used to have institutional usage. They used to be distributed by armies, take part on religious practices, have explicitly regulated import quotas to keep the population "calm".

We have nothing like that today.

> lack of warmongering we got since the late 20th century

Srsly? Where have you been hiding? Where is this place where wars are not being fought?

lead or lead lead?

https://en.wikipedia.org/wiki/Lead–crime_hypothesis

Lead doesn't explain it, warmongering is something that has been high since ancient times, but airborne lead dates to the 20th century.

Dietary lead in the form of sweeteners for wine plus a little abraded from cups and pitchers has been present since antiquity, so could still stand?