Why look in foreign countries, we have plenty of our own. Not to mention the quack female that got caught pepper spraying a duck in Florida. They seem to have a bunch of them down there, that's where the cop arrested the girl and put her in jail when she was going to the hospital for a rape test. Jackbooted anyone?
Because they provide a useful perspective for those who perhaps haven't traveled and who apparently forget about the endless microscopic exams that police officers here in the USA face after every action of theirs involving any use of force. Few nations hold their police to the rigidly high standards of professionalism that we do, and few nations are so quick to fire or prosecute officers who step over the line. I'm not familiar with the specific incidents that you mention, but you can rest assured that if any wrongdoing on the part of the police was involved, they will be held to account, just as they were in this Florida taser matter.