However, I should clarify, the point regarding being able to lift a dog that you own is not so that you can physically control the dog in a dominating fashion (I am of the opinion you should not try to dominate a dog as with a large or powerful dog it could end badly). It is more so that if you are walking the dog and it suddenly pulls towards a squirrel or something you are not instantly pulled off balance. Also, if the dog were to be injured that you could get the dog to your vehicle to drive to the vet.
Your point, however, is well taken. Police K-9s may only weigh 50 lbs but easily take full grown men weighing 200 lbs to the ground. No one should try to dominate a dog. That teaches them that that is how you interact with people and they will eventually do it to someone else if not you.