Casualization != correlation. People banged a lot back then as they were stuck in home with money in their pockets and nothing to do outside, and getting cheap loans for real estate was not a problem, so having kids didn't seem like a bad decision, not because they had more confidence in their government. Though during covid and lockdowns a lot of couples also broke up.
This trend has rapidly came to a halt in 2022 to 2203, with the war in Ukraine, inflation, high mortgage rates, insane energy bills, high food prices, exploding costs of rents and buying real estate, unavailable housing, longer waiting times in the healthcare system and a shortage of staff, layoffs, hiring freezes or stagnating wages in the private sector, etc.
With the way things happened last in the last 12 months, average people really lost hope in the government, the economy and in the future and aren't rushing to have kids at all.
Though I'm only talking about Europe, not "the west". Maybe things might be different elsewhere like US, Canada or Australia.