The actual root causes are economic but there's a psychological feedback loop at play as well. I lived in Germany for a few years and got culture shocked when I

The actual root causes are economic but there's a psychological feedback loop at play as well. I lived in Germany for a few years and got culture shocked when I attended a 40th birthday and realised that I was the only parent in attendance. When society gets itself into a situation where not having kids is that normalised, it gets fairly easy to validate the choice not to have one.