My own take is that it's partly (or largely) because people are having their brains cooked on X, TikTok and other platforms. You cannot have any meaningful public discourse on those without hoards of bots vying to convince the uninformed that what's up is down and what's down is up. It has a hypnotic effect over time and even researchers of disinformation are not immune. They need to take breaks and do resetting behaviour.
For balance, Irish people are still overwhelmingly sound. But there is an elephant in the room we are not addressing.