I agree. I went Paleo 2 years ago and it made blood sugar much easier to manage.
1) Meat gives my body the correct satiety signals, and so staying away from all of the carby treats that I use to find so addictive is no problem. It's easier for me to eat the right foods AND eat the right amounts of those foods.
2) Meat is not made of sugar like high carbohydrate foods are. The protein of meat needs to undergo a slow metabolic process (gluconeogenisis) in order for my body to turn it into sugar. What this means is that my food is "slow release" energy (sugar) as opposed to an instant sharp spike in sugar. Predictability is key when you need to manually inject the correct amount of sugar consuming hormone after every meal.
This diet is also great for EVERYONE... But that's a different discussion.
Which brings me to your second statement that "consuming animal protein" is "very bad for humans". Do you realize that humans and the ancestors of humans have been consuming animal protein for 2 million years? Our metabolisms EVOLVED for eating animal proteins. Consuming animal proteins is the only way our species has been able to survive and thrive in ALL climates from the north to south poles, many places where vegetation is only available three months out of the year. Animal proteins are the only food available to us which include all 20 amino acids necessary for optimal health. Pound for pound, meats are drastically more nutrient dense than any other form of food. What the hell are you smoking?