In the last 5 to 10 years everything seems to suck: product's and services quality plummeted, everything from homes to cars to food became really expensive, technology stopped to help us to be something designed to f@ck with us and our money, nobody seems to be able to hold a job anymore, everyone is broke. Life seems worse in general.
My "why has the world gone to shit" was the 2007/8 banking crisis when everyone realised that you could pull off any swindle you wanted and no one would stop you. So everyone did/everyone stopped trying to hide it.
So presumably people older than me would point to the start of Trickle Down Economics, and so on
Everyone has their own "None of this works and it's intentional!" moment