I grew up in a religious household that eventually became infatuated with what essentially amounts to doomsday cultism after the 2008 financial collapse.
The religion encouraged a lack of critical thinking development, and I easily bought into the scheme. We became fairly extreme preppers, stockpiling food, planning to move somewhere even more remote that wouldn't be a nukeable target while also not being downwind of fallout from a neighboring target. We purchased plans on how to build various styles of underground bunker on a budget, and guides on how to rear animals and farm for subsistence.
At some point I came across a video of Christopher Hitchens debating a Pastor. I almost didn't watch it, as I was afraid that to even entertain the ideas of someone trying to tempt you away from the faith would be dangerous, a way for Satan to worm his way into my mind and prevent my soul from being saved during the end times that were right around the corner.
But I was curious too, very curious. So I watched it. And I couldn't come up with a single logical argument of how he was wrong.
That was the first glorious crack in the mental armor I'd put up against doubt of any kind. I would think about it frequently, which led me to want to find evidence that would prove him wrong, so I watched a different debate with a different pastor, then another, each one widening the gap, until one day I had to admit to myself that it was bullshit, from top to bottom.
That opened the floodgates. What else have I not questioned? All this prepping, for what? All the mistrust in others, the seclusion, the countless hours of research on how to (impractically) survive as independently as possible... it was all pointless, or worse, actively mentally harmful.
Amazingly, when I slowly presented all these findings to my family, they saw reason. I think they were all as worn out from the constant terror we guzzled down from crackpots too, and if anything were relieved that it could come to an end.
From that point on, I made an effort to give myself a proper education, to finally trust in the scientific process, and to not be so intellectually lazy that I could be tricked into something like that ever again.
So the last time I really changed my mind in a major way was about a decade ago.
Long is an interesting example, since he definitely did strongman Louisiana politics, but he did seem to have the working class interests at heart, where as Trump only pretends to. We didn't get to see what he would do long term, but its been argued that his presidential run, and more specifically his 'share our wealth' program forced Roosevelt even farther left in his policy.
Share the wealth proposed to put into federal law a wealth cap of 5 million for every American, with the excess used to fund what amounts to a universal basic income back in the 1930's, and didn't discriminate against minorities. It also advocated for free education, free healthcare, and a 30-hour work week.
From all the information I've seen, including the excellent Ken Burns documentary, the poor and working class of Louisiana loved Huey for legitimate reasons, while the rich and politically corrupt, who were targeted by him, absolutely hated his guts.