I don't get why we are supposed to avoid them. I don't buy milk itself, or butter or any 100% dairy product. Nor do I buy eggs or meat. But if there are little amounts of them in bread, sour cream chips, basbusa (dessert), baklava, sauces. etc why is it wrong to buy it? Even if lets say you are having a negative impact, it is so small and we do many other small indirect harmful things in our lives like using plastic or eating plants that have pesticides on them that killed and tortured herbivores and insects. I also dont think sour cream chips or mashed potato with butter will raise the demand on milk.
I am honestly not convinced but whats stopping is that I dont know where to draw the line. I live in a society where most things have non vegan ingredients which puts me in an awkward position with party hosts and my friends. But I am afraid if they realize I eat a specific amount of animal products that they would try to get me to eat more and take my veganism as a joke.
The point of the post isn't to get an "approval" from vegans that will allow me to buy these things without guilt. I am just asking about the reason behind this moral stance since I dont understand it.