Military grade biological weapons, specialized chemicals and their delivery systems, ion proplusion on asteroids, nano-technology are more dangerous than nuclear weapons because you don’t even know you’ve being attacked until it’s too late. As more and more technological interdependencies are created, the failure on a single link can bring down the entire system. Thus cyber wars are a potent threat to the most technologically advanced countries.
We will see people starving with food rotting on the farms types of situations in the future.
Artificial Intelligence will inevitably be used as a weapon to find the non-obvious weak links in a system. The cost to kill ones enemies will be measured in tenths or hundredths of a penny. Additionally, the availability of weapons of mass destruction to smaller groups is likely to increase because of lower cost and greater availability of information. Think CRISPER, the off the shelf DNA editing kit. A small group or maybe even an individual in the future may be able to change the geopolitical landscape all by themselves. They will be hard to discover. Imagine what the the Las Vegas shooter could have done if he had the inclination and access to these technologies and techniques?
Instead schools being affected, they could target a city, an entire religeous group, a political group, a specific organization, etc.
The ability for a small group to use technology as leverage to atempt to advance its agenda is a scary thing to me and is a much more serious issue than school shootings (for example).
It appears the only chance the humans have for long term relevence or survival, or short survival for that matter, is character and tolerance. Do you feel lucky?