I'm not going to argue that there aren't other ways to get calcium in your body, but you have to understand that taking milk completely out of the equation leaves you with very little food left to get your calcium from, with very little bits of calcium in them.
Dairy products all contain milk in them of some form so say, you don't want to drink milk because of ethical reasons, you can't have yogurt, cheeses, ice cream...ect. I know people who are lactose intolerant to the extreme and cannot have any dairy except the soy milk. You can, however find soy versions of all those products. It's more than what I can afford, but you can.
Soy milk, if I'm not mistaken, and it's products have at least the same amount, if not more calcium than cow milk.
The problem with this thread is that both sides are spewing a bunch of crap that no one in the medical community that I know of supports on either side.
You need calcium. The best source for that is dairy products. Even milk is "calcium supplemented" but still remains the best source of high amounts of calcium (whether it is cow milk or soy milk).
The WORST way to get calcium (according to every doctor I've been to, many who have yelled at me about my lack of milk consumption) is by pill supplement. There are myths about contamination and such, but the truth is, your body only absorbs x amount of calcium from those pills and it's not anywhere near enough. Every doctor I've talked to in my time have told me the same damn thing, "if your not going to drink milk, then eat calcium rich foods, stay away from a supplement".
Here's a comparison chart for calcium in foods:
Milk
Other than milk
As you can see, dairy still ranks the top of the list.
The reason there is an increase in osteoporosis is many people are misinformed and think that milk is all they need to keep their bones healthy. So, they don't bother with other calcium enriched food. Whereas, someone who maybe just doesn't like the taste of milk, will actively find other ways to consume calcium to compensate (based on the same misinformation). This doesn't negate that both parties are consuming dairy products.
The truth is, any diet at all that eliminates any part of food consumption is dangerous. The most extreme case I saw of this was Dr. Adkins. He followed his fool hearty diet for many many years and when he was literally forced into a healthy balanced diet, he ballooned up and died weeks later. I've seen this happen with all diet fads, vegan and vegetarian lifestyles (in cases where a dairy substitution is not used). The true key to being healthy is watching portions, and making sure that there is an array of different nutritional foods on your plate. I mean face it, a dinner of soy beans, soy milk, and soy meat substitute is not going to give you any better chance of nutritional enhancement than that of the Adkins' diet of meat meat and more meat.
The other thing that most people have wrong about how to eat a healthy diet is cooking their food. Meat is one of the only things out there that doesn't loose it's nutritional value with cooking (which is very good). But with most veggies and fruits, the rawer the better. Any time you get a processed food product (like with many of the commercial soy products) all nutritional value has been drained from it and then unnaturally put back in. Which is sort of like the controversy of giving the cow special supplements (steroids and antibiotics) that in the long run were harmful to humans. I'm willing to think that it's not healthy to consume large amounts of unnatural "nutrients". In fact, I'm willing to bet it's hell on your liver. But these are just my opinion and that's based on the fact that I've seen what nutrients in pill form have done to people's livers and that doesn't mean that you liver cannot process these "nutrients".