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The danger with no-carb diets is that you can end up with too high of a percentage of protein, and this can lead to ketosis, which is where your body starts breaking down protein for energy instead of glucose, which is hard on the kidneys, among other things.
When people say "carbs" they mean grains and sugars, but in actuality, there are carbohydrates in almost all foods, including fruits and veggies. But plant carbs break down differently in the body, so they're not the same kind of empty-calorie carbs that people are trying to avoid with what they call no/low-carb diets. Your body must have carbohydrates in some form, or it goes into ketosis.
If you read the entirety of Atkins' advice, you are supposed to replace bread-carbs with lots of veggies, and people who are just starting out are advised to regularly check their urine with Ketostix (available over-the-counter, used primarily by diabetics) to make definitely sure their diet is properly balanced and they are not in ketosis. But most people don't learn the complete rules of the diet; they just hear the part where they shouldn't eat bread, and decide they'll eat a pile of pork chops for dinner every night instead, easy peasy.
Bottom line, protein should be no more than about 25% of any diet. (And ideally part of that should be nuts/legumes instead of all meat, but that's a different issue.) As long as you're replacing all your eliminated grain/sugar carbs with fruit and veggies, you should be fine.
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