So a friend went through the trouble of double proving on his own body that diary is bad for humans. For men - proven on him, for women - proven on other friends.
He cut eating dairy some time ago and as a result lost his man-boobs. That is despite still being half vegetarian. Then he turned carnivore. As a result, lost large weak muscles that were replaced with small strong muscles. Then he started eating some hard aged cheese daily. Soon his man-boobs started coming back. So on top of being immoral, milk is poisonous.
Another thing, people eating much dairy are much taller, including women. Entire populations. This is not inheritance, height of specific individual regardless of race depends on milk consumed.
I am tall myself, having grown on much milk. Being tall is bad. Makes you weaker, slower, less efficient in every regard. 

 But that opioid in milk... really hard to resist. But cigars seem to be less detrimental. 

 Lost me at giving up cheese. 

 Very hard, I know. This helps me a bit: smoke some cigar, not much, like for a minute, then drink a raw egg on top. Then black coffee. Then repeat :) 

 Fully support the smoking and the black coffee. I’ll cook my eggs though and probably add some cheese. 

 That's the problem with good life, you need poison to help fight the boredom. But I do try to resist cheese very hard. Harder than I resist sugar and alcohol.
Tea, coffee, and cigars - I don't even try. I practically run on them. 

 Alcohol is for sure a vise for me. I smoke a pipe regularly. Aside from that. I raise/grow a bulk of my own food and mainly stick to what’s reasonable. In all things, moderation. 

 But I do deep fry my meat in ghee butter. That seems to be no problem. I guess estrogens stick with proteins, not with fat.
I know, tallow would be better. But there is no tallow on sale, gotta make that myself. While ghee butter is easy and cheap. 

 Milk ≠ raw milk from good cows 

 Estrogen is estrogen. It is poisonous and immoral. 
I don't know if it is less poisonous than plant based food, but if you can eat meat and eggs and drug yourself with caffeine and nicotine, there is no reason to even look at milk -  raw, sour, processed, sintetic or whatever.
As a child I was fed raw milk and its products milked and made at home same day same hour even, and I grew up long, weak and sick. An elderly person I turned carnivore and no diary and much tanning, and turned strong and healthy which I have never ever been since I was born. We will see if I get shorter too 😂. 

 Nah. It’s just that meat is one of the things they’ve had a really hard time poisoning. They’ll get there too if we let them. I’m way over the hill and way healthier than most I know. Always been a big milk drinker. Never been more than 15lbs overweight. Usual right at healthy weight. 

Give me your single most powerful piece of research 

 I am happy you are happy, and therefore you should keep doing it.
I don't research. I experiment myself on myself. With some friends. Milk gave us tall bodies and man-boobs. It may be 100 other bad or good things, but I don't like these two. That is on top of the fact that I don't like keeping and milking animals.
So milk is bad enough for me.