The scale is debatable, but there is a lot more evidence for this than you might think.  It&#x27;s also a lot more than just gas, paint, water pipes, sodder, even fillings also made significant contributions.<p>IMO, scale is not that important as the preverbial straw that broke the camels back is  important, but so are all the others that get to that point.  A leaning disability on it&#x27;s own might not lead to violence, but it does reduce people&#x27;s options even further.<p>PS: Mercury was also known to have neuron toxic effects. <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Mad_hatter_disease" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Mad_hatter_disease</a>. However, lead is more of an issue at developmental stages. <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Lead_poisoning" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Lead_poisoning</a>