Dairy cows exist because we actively breed them. We inject dairy cows with sperm to keep them pregnant so they keep producing milk, then take their calf away and repeat the process. They're not multiplying on their own.
I would argue that no existence is better than existence filled with endless misery, agony and pain.
Factory farms are a disgrace to humanity. It is my opinion that until we develop enough compassion to see this and stop, humans have no hope of creating lasting peace amongst each other. Our morality has a deadly wound at its core, and it’s rotting away at our souls.
The answer to all of these is obviously no. So why do you make the case for cows?