How come SN Goenka thought that buying milk does not lead to suffering?

During the lectures on a 10-day vipassana retreat, SN Goenka made it clear that an action is unwholesome not only when it directly causes suffering - e.g. shooting at sentient beings, but also when it causes it indirectly - e.g. when one sells weapons. How to reconcile that with the fact that milk and dairy products are available for eating during the retreats? There is no doubt that buying such products amounts to supporting the dairy industry, and causes suffering of farmed cattle. Answers to [this question](https://buddhism.stackexchange.com/questions/5948/why-is-contributing-to-the-market-demand-for-meat-not-wrong) suggest that eating meat or drinking milk is not wrong, as long as one does not kill the animal directly. It would mean that SN Goenka was wrong, and selling weapons is not wrong either. Do I understand it correctly?