Anyone who gives you just one factor isn't thinking hard enough. Univariate analysis < multivariate analysis
- Lack of unifying culture (religion used to do this)
- We used to have to rely on each other for our entertainment, now we have technology to amuse us
- The fact that we don't socialize as much anymore = our social skills have degraded, which means we are worse at navigating conflict & maintaining relationships
I could go on. This is a subject that I've thought about a LOT. But for the sake of brevity, I'll leave it there.