Here are many reasons why cow milk AKA Dairy is bad in 4 of the 5 major categories when evaluating it's value:
Cows milk does not taste good to me, but I do like the taste of animal fat is deserts. Society tends to accept that dairy taste good. It's Subjective and the least important reason to eat or drink something!
When cows milk goes off, which it does easily it smells wretched! That is the smell of fermenting cow puss.
There are many negative health effects of regularly consuming cow milk. Particularly from the high density of fat with no fiber. This causes issues in human digestion leading to a wide variety of problems such as: Farting, constipation, colon cancer, diabetes and rapid weight gain. It is a source of calcium, but since beans and green vegetables are also high in calcium, cow milk is a low quality source of nutrients.
The Factory Farm Dairy Industry spends millions on pro milk and diary commercials to cover up how bad it is for you and destructive it is for the environment. They also lobby the USA FDA to add "Dairy" as a nutritional category, when it is not an essential food group. Our bodies of course don't require cow milk as an adult. They've finally added "Soy milk" to what they accept as "Daily" yet there are tons of other types of plant based milk high in calcium such as almond milk.
Plant Based Alternative Milks are Healthier
Contrary to mass marketing; A Plant-Based Diet Can Build Strong Bones. Fat people who drink milk have more fat padding around their bones, so they are less likely to break when you fall over.
Buying and eating dairy products is an atrocity. You can't drink dairy and pretend your not stealing milk from a baby cow who's mother only produces milk for her children. That Mother cow probably didn't want to have a baby and never got to have a relationship with them. Awful ethics to sponsor the cruelty of the diary factory farms.
Cows milk is for baby cows. Its so obvious, yet some of our society is blind to it. Mother cows only make milk after having a baby. If you are not that baby, it's not meant for you.
Buying and Consuming Cows Milk Causes Massive Environmental Damage and is a Major Contributor to Man Made Global Warming
You can't be spiritual person while consuming milk stolen from a baby cow's mother you don't care about. That would be delusional, while spirituality is about awareness.
Spirituality leads you to understand that human consciousness is unique, but all sentient beings are conscious like you are. All sentient beings value their own life more than anything. Like you, they don't want to live a life of suffering as a prisoner or a consumer commodity.
Anyone who considers themself spiritual will naturally move towards and adopt a plant based diet or be a hypocrite. Only if a spiritual person has take care of the cow they drink the milk from would it be spiritually permissible or justifiable. If you take care of and protect a cow, you are spiritually allowed to drink her milk if you spiritually believe the cow would be ok with that in exchange for food and medical care.