People working in the manufacturing of them (many in countries without worker's rights protection), people who live in proximity to manufacturing facilities and raw material production facilities for lead material products, and people who live in proximity of landfill and storage of such materials, and are exposed to soil and water into which the material has been leached.
Why use a product that contaminates through its entire life-cycle, when alternatives exist? You might have a different opinion on this topic if you lived on property where your drinking water cam from a well and the well was down-gradient of a leaking, single-walled underground storage tank containing lead-based waste.