Ummmm - no. Most Cougar attacks are juveniles - less than 3 years old and weighing around 100lbs. They aren't very good hunters. They hang around too close and watch you. They want to kill you but they don't know how.
When you see a cat, and that cat isn't running away, you've got a dangerous situation. You need to be shooting, or attacking with sticks and rocks, or blasting with pepper spray. But since most people don't speak Cougar, most folks misinterpet the Cat's behavior as being "friendly".