Raw meat making a dog more aggressive is just a myth that has been around for many years.
What makes a dog aggressive is people training the dog to be aggressive or mistreating the dog and then expecting the dog to not be aggressive.
As long as you treat the dog nicely and show your love for the dog and don't agitate the dog then feeding the dog raw meat won't make them aggressive.
If the dog becomes aggressive then it's because of something else and not the raw meat.
Raw Meat is actually very healthy for dogs and some vets put dogs on raw meat diets when they're sick or have some other ailment.