Earlier quoted context omitted.
Do you think what a person reads has no predictive value on their 'moral value'? (An admittedly vague term) Trivially: someone who reads NRA's weekly newsletter religiously is more likely to be pro gun, pro republican, and pro 'life', for instance
This kind of thinking completely discards the concept of intent. People read things for all kinds of reasons. I have a family member who was an avid reader of the "Weekly World News", yet he did not believe in aliens, "Bat Boy", or the illuminati. I used to regularly read conservative blogs and listen to Fox News to keep up with what people I disagree with are doing/saying. So the problem is that you can make some st…
To your example of BMI, it would be a perfectly reasonable public health policy[0] to use machine learning to probabilistically identify persons of an excess BMI to send them pamplets and resources for weight loss / exercise. Will the odd fit person get a letter from the surgeon general telling them "being a fatass is bad for their health"[1]? Of course. I don't see why that is a terminal problem.
[0]If a bit creepy for the privacy aspects - which are out of scope here.
[1]In far more words than is necessary, of course