Feeding your dog some raw meat does not cause a dog to become more aggressive or aggressive.
Now naturally when you feed your dog some raw meat and then approach that dog while it's eating the raw meat then it may snap or growl at you which is a normal reaction because the dog may be thinking you're gonna take the raw meat or food away from them.
So naturally you'd get a reaction like that and it may seem like the dog has become aggressive as a result of the raw meat.
In reality though it's just because you're approaching the dog while eating that delicious meat and they do not want you taking it away from them.
I've fed my dogs raw meat for many years and never once did they become aggressive or more aggressive as a result of occasionally eating some raw meat.