> It's always been raw milk, warm and fresh from the udder. And the first thing they do is to boil it.
Two things: Firstly, it's not raw if they boil it. Most store-bought milk has gone through two processes: Pasteurisation and homogenisation. Pasteurisation is simply heating the milk. If your family boiled it before drinking, you've actually heated the milk more than commercial pasteurisation does. Normally pasteurised milk is heated to only 72 degrees celsius for only 15 seconds. Homogenisation is essentially forcing the milk through filters that breaks up the globs of fat. Only pasteurisation is necessary for food safety.
And secondly, pasteurisation is most necessary if you intend to store the milk. If, as you say, it's "warm and fresh from the udder", there's little risk from drinking raw milk.
The parent of your post specifically said selling raw milk through the normal store channels. The issue is not raw milk, but selling raw milk, which when you combine storage and transport, and the consumer storing it, means plenty of time for massive amounts of bacteria growth. As I'm sure you know, even with normal pasteurisation milk spoils relatively quickly.
> If I were to conjecture, it's that the "no raw milk" diktat forces farmers to go to big distribution companies with the requisite facilities for pasteurization.
Health authorities first started to push for pasteurisation after its extensive success in massively reducing illnesses - and deaths - due to spoiled milk.