Animals suffer in the production of dairy products. Is this morally justifiable?

Feel free to discuss:
1.Do you believe it is wrong to harm and kill animals when there is no legitimate reason for you to do this? And that pleasure/convenience/tradition aren't legitimate reasons for harming animals?

2. Given that we have no nutritonal need for animal foods - can the following suffering and death that animals used for dairy products go through - be justified?:

"Female cows used for dairy get slaughtered for their flesh so continuing to consume dairy is arbitrary and means you are still directly supporting animal slaughter.

Male calves will not produce milk so they are worthless to the dairy industry so they are removed from their mothers so they do not consume their mother’s milk and slaughtered for their flesh (veal). The dairy industry is the veal industry.

Female calves are removed from their mothers so they do not consume their mother’s milk and raised to become a cow used for dairy or slaughtered for their flesh."

More to learn here: http://www.abolitionistvegansociety.org/tavs-initiatives/tavs-articles/how-to-go-vegan/should-i-go-vegan-by-adopting-a-vegetarian-diet-first/#.UxtCGoWHh2g

“The very saddest sound in all my memory was burned into my awareness at age five on my uncle’s dairy farm in Wisconsin. A cow had given birth to a beautiful male calf…On the second day after birth, my uncle took the calf from the mother and placed him in the veal pen in the barn—only ten yards away, in plain view of his mother. The mother cow could see her infant, smell him, hear him, but could not touch him, comfort him, or nurse him. The heartrending bellows that she poured forth—minute after minute, hour after hour, for five long days—were excruciating to listen to. They are the most poignant and painful auditory memories I carry in my brain.” Michael Klaper, M.D.

Humans can live and thrive on a vegan diet: http://bloganders.blogspot.no/2013/08/humans-can-live-and-thrive-on-healthy.html

3. Do you think any animal use can be justified? What animal use?

Please also provide your arguments.