Yes, that might be. But for it to be effective the dog has to at least once feel the pain of the actual shock which comes after the vibrating. For most dogs I imagine they would have to feel the pain several times before they get the message and heed the vibrate only.
You should really educate yourself if your going to try and argue a point.
It is not meant for pain and does not cause pain, if something was buzzing at your neck at a high speed it would be uncomfortable and get your attention.

Shock collar USED to be used centuries ago but times have changed, do you really think they would able to be sold if they caused the dog so much pain?