Much easier to grift off FUD than hope, and for many that income stream and power are near impossible to walk away from. If they tell themselves a lie enough they begin to believe it almost as much as their base does, and it’s easy to get caught up in and go down the rabbit hole and end up outside of reality.
It’s also easier to rationalize being the victim of “them” than it is coming to terms with being out of touch.
It started with a bunch of kids getting lead poisoning from applesauce pouches. They then traced that back to how most spices are sourced from poor countries using basically slave labor. So, these people are both not the most careful in preventing contamination, but those paid by weight of spices are almost incentivised to cut the spice with a heavy metal or something to get more $/per lbs. for example.
Edit A good amount of chocolate and other delicious things, in the US at least, also have a “totally safe” amount of heavy metals.