Every country with electricity had decades of exposure to lead. Kettles, coffee-makers, percolators, etc. - all used lead solder.
Every other country had everyone exposed to lead piping for decades as well.
So why is it the US that has these problems, and nowhere else? American culture. Everything else, from exposure to lead paint to lead in gasoline was the same. Correlation is not causation, not when the correlation only works in the US.
There's a much stronger correlation with poverty. Quit blaming your problems on lead. As I said, lead doesn't cause employers to reject people with black-sounding names. That sort of racism is a stronger factor than lead. Especially since the people doing the shooting today are mostly not living with lead in the plumbing. Flint was for a couple of years, but the violence there pre-dated that, and the municipal and residential plumbing with lead pipes is not unique to Flint.
City and state governments are still advising people to run their cold water tap for 30 seconds before using the water for drinking or food preparation because of lead, and 2 to 3 minutes if it has not been used for a few hours (overnight when everyone is sleeping, or at work).
Even brass keys, handled twice a day, exceed exposure limits.
handling keys - ordinary brass keys like you'll find in your pocket or pocketbook to lock and unlock your house door - may expose you to the toxic chemical lead at levels that exceed Proposition 65 limits," Lockyer said. "Given this discovery of lead exposure, parents may want to rethink using their jangling keys as a convenient toy for their toddlers and small children.
In laboratory tests for the state, researchers looked at more than three dozen keys from 13 different makers. While the researchers found widely varying levels of lead on the hands of test subjects, the very lowest test results still exceed the Proposition 65 "No Significant Risk Level" of 0.5 micrograms per day when doubled on the assumption that people handle keys at least twice a day. While the highest testing results were 80 times the 0.5 micrograms per day limit, the average of all keys tested was about 19 times the "No Significant Risk Level." Both new and old keys tested were found to release lead at fairly similar rates.
Brass taps, fittings, etc., all leach lead. Everyone was exposed, many are still exposed.because they don't run the water for 30 seconds to 3 minutes. And yet, the problem of violence at levels like those in the USA isn't seen in other OECD countries that had/have the same lead exposure. Next you'll be claiming that Rome fell because of lead in the plumbing ...