I still don't understand why the great majority of Muslims are soo blind

They act as if the incident at Ghadeer never happened! Despite this being one of the most narrated event in the Islamic history. And today is the 1079 anniversary of that event.

Happy Eid al-Ghadeer to all the believers of the Wilayah of the Ahlul Bayt. And here is a wonderful video that can be enjoyed by everyone, including those who don't believe in the wilayah of Ahlul Bayt.

Video of Eid al Ghadeer

This is the last sermon of the Holy Prophet (peace be upon him). He told the Muslims that he is leaving behind two precious things and if the Muslims adhere to them, they will never go astray.

The first precious thing is the book of Allah swt.
And the second precious thing is his family (Ahlul Bayt)

And the Holy Prophet (pbuh) said that “the two shall never separate from each other until they meet me at the pool of Kauthar in Paradise”

Then to emphasize his message and to let the people know what he means by his family..in case someone had doubt about his family, he called Ali ibn Talib to the podium and said
“For whoever I am his leader (mawla), then Ali is also his leader (mawla)”.

Detail event of the Ghadeer http://www.al-islam.org/ghadir/incident.htm