Ok, those videos that you found are extremes caused by bad owners.
I will admit these vids make the breed look pretty bad, but if you take the time to properly train the pup it will pay off. It isn't easy, I struggled with Henri a few times but now he is a well behaved boy. All it takes is time and patience, don't let these extremes scare you off
If you truly feel that Yorkies aren't for you then look into other breeds, but remember that any dog can turn into a little monster when not properly cared for and trained.