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Do we have many people dying from lead and pests nowadays?You misunderstand the problem.
You "die" from a heavy metal or other accumulating poisons only if you get an acute poisoning with a pretty large amount.
But if you get only tiny amounts for decades you don't die. You just suffer form a lot of "minor" ailments, and most of the time nobody even attributes it to lead (or mercury or whatever). That's because the correlation with aging is almost 1 - after all this can go on for decades with imperceptibly tiny increases in issues, completely in line with aging. Your brain will function less well. Your eyes may be dry and other minor sight issues. Key word "minor", you will not have some big clear symptoms, you will have lots of small issues. A few more warts from decade to decade. A bit more psoriasis. A few cramps. You are more easily tired ("it's the stress"). Maybe some slight depression, occasionally, and you don't get anything done. You get more colds than ten years ago and they last longer. Allergies start and grow.
Check my history, I posted about it, I had chronic (mercury) poisoning diagnosed, and only through luck and persistence. I have a long list of such symptoms that are all gone now even though I'm ten years older now than when I started (chelation) treatment, and which I myself, just like any doctor, always thought were "normal" issues that everybody has. That includes stuff like a nodule disappearing from my thyroid and the thyroid shrinking to normal size, to the great amazement of the endocrinologist, under chelation treatment within less than a year, after it had been there for over two decades. Needless to say, instead of asking questions and following up on how I achieved the miracle - nothing at all. And it wasn't some random miracle that cannot be explained, clearly this had to do with the chelation treatment, since that exact area became very active exactly after the 4th or 5th such treatment. Nobody cares.
Anyway, your post shows one of the problems: If there isn't a big problem visible right away there is none. Heavy metal poisonings with tiny amounts over decades are next to impossible to prove, unless you are "lucky" and for some reason when you are tested you actually have quite a bit moving around in your blood (unusual for such chronic exposure, where most of it is stored in various organs).
So nobody knows - wants to know? - how big the problem really is. My own doctor, researcher at a university clinic, is pretty pessimistic though.