Ok, so on one hand you can moan about regulations which require you to comply to some minimum, easily achievable standard such as using lead-free solder on pottable water. It shouldn't be hard.
But then you mention how the food companies are putting cancer chemicals in your food and water companies are adding stuff to your water?!? FFS, talk about paranoid - you can actually check your water content online and the food companies tell you on the packet whats in it (thanks to regulations btw).
And off-topic I know but few people died of cancer in 19th century because they were dead from malnourishment or disease long before they reached the age where 1 in 4 gets cancer today. And even if they did get cancer, with no cancer screening how would they know it? And if they did know it, they didn't have ONS to compile the nationwide statistics and produce a 1 in 4 figure.
Ultimately, people like me will report plumbers like this. Someone will compile statistics and if the numbers add up, pass legislation to take the leaded solder off the shelves. If people can't comply to simple rules, the choice gets taken away for everyone. If you don't like it, places like India are far more relaxed about stuff like this. Just don't complain when they send you on the job with some asbestos rope and a pot of monkey muck