In all airports that I’ve been through (all in Europe), the scanners for people + their carry-on luggage are from the customs agency, so from the government. They won’t check or enforce any airline weight limits there. The airline may still ask to check the weight of carry-on luggage at the gate, but I’ve never seen it as an automated process, only as spot checks.
Access to safe drinking water was a known issue in loads of places at that time, not just in developing countries. My dad grew up in the 1950s and still drank table beer in his elementary school. There’s no way that a 1960s food scientist would have been so incompetent, to not know that not everyone had access to clean drinking water. We can also know that they weren’t acting in this way out of ignorance, because they continued with their unethical practices for years after the consequences became public knowledge. They only stopped because of the world wide consumer boycott. And only a few years after they promised to do better, they started rule dodging again. They simply don’t care about people, only profits matter.