I don't need to know all Shi`as in the world. What does Islaam say about Jews and Christians? They are Kuffaar. Correct? Now, how can you say they are Kuffaar? Using your logic. You haven't met every Jew and Christian in the world. You haven't met every atheist in the world. You haven't met every satanist in the world. You haven't met every agnostic in the world. You haven't met every Buddhist in the world. You haven't met every Hindu in the world. How, then, can you say they are all Kuffaar?
It is a simple matter of affiliation. This particular group is a Kaafir group. Any person who affiliates himself with that group is a Kaafir.
Once again, use the example of how things are in Kaafir world. America says al-Qaa`idah is a "Terrorist Group". Thus, any person who affiliates himself in ANY way with al-Qaa`idah is labelled as a "Terrorist". Someone was arrested in South Africa just for having the flag on their window:
Just the fact that they had this flag on their window got them arrested, because the Kuffaar consider it to be "The Flag of ISIS", even though it is the design on the ring of Rasoolullaah صلى الله عليه وسلم which he used to stamp all his letters using.
This is how affiliation works. The world doesn't work the way you want it to. There are rules and regulations. There are consequences.
The Shi`a group is a satanic, Kaafir group. Thus, any person who affiliates himself with this group is a Kaafir.
If any person affiliates himself with the satanists, everyone will unanimously call him a Kaafir. Yet, do you know all of his beliefs? Maybe he doesn't have all of the beliefs of the satanists. But, the mere fact that he affiliates himself with satanism will be enough to have everyone be against him. It is the same with the Shi`as.
Also, watch the videos of the Shi`as. When their "scholars" are making those Kufr statements, the Thousands of Shi`as in those temples are all moaning and crying in approval. They are all the same. Only idiots get fooled.
People really need to Get Smart.