Almighty Allah has sent Prophets to mankind to guide people to believe in Him. The last amongst them and their seal is the master of Prophets and Messengers Mohamed, the son of Abdullah (peace be upon him and his holy progeny). Clear evidence to this prophecy is the Holy Quran. It has great qualities that prove its revelation from God.
"And whose seek as religion other than Islam it will not be accepted from him, and he will be a loser in the Hereafter" 3: 85.
What is known in the Sunni traditions is that these verses were referring to the Prophet (peace be upon him and his holy progeny) and the description in the verse “frowned and turned away” refer to him, when Ibn Umm Maktoom approached him when he was talking to certain dignitaries of Quraish. The Prophet (peace be upon him) was hoping that they would accept the religion of Islam. Ibn Umm Maktoom was blind and came to the Prophet (peace be upon him) seeking for guidance and knowledge with insistence when the latter was busy talking to those people. The Prophet allegedly did not like this and turned away from the blind man frowning. The verses were revealed to rebuke the Prophet for his behavior.
This is the common version of the Sunni sect. However, the mentioned incident was not narrated – according to this interpretation – by a person who were present at its time. It was narrated by Aisha who was a child at the time of the revelation or was not born (based on the difference in her birth year). It was also narrated by Anas and Aslam, and both of them are from the tribes of Ansar in Medina, whereas the verses were revealed in Mecca. In addition to this, there are also issues with the authenticity of the chain of narrators of this interpretation.
Some Sunni scholar did not agree with this interpretation of the verses. Ibn Hajar stated that Dawardi said that the one who “frowned” was a non-believer. Tirmidhi described this narration as “Odd”. These are clues that this version of the story does not corresponds to what is known to all Muslims about the high level of morality of the Messenger of Allah, and his patience and tolerance.
Shia scholars – to the contrary – unanimously agree that the one who ‘frowned and turned’ was not the Prophet (peace be upon him and his holy progeny) as this does not correspond to his ethical behavior. A narration from the Imams of the Ahlulbait (peace be upon them) stated that Ibn Umm Maktoom came to the Prophet when he was sitting with his companions, one of them embraced Islam in Mecca and was wealthy and from the tribe of Bani Umayya. The Messenger of Allah welcomed Ibn Umm Maktoom and favored him over the rich man; the latter frowned in the face of the blind man. The verses were revealed to rebuke this act by stating: “As for him who is wealthy unto him thou payest regard. Yet it is not thy concern if he grow not (in grace). But as for him who cometh unto thee with earnest purpose and hath fear, from him thou art distracted.”
We can comment on your question by stating the following: 1. The Imamate of the Imams (peace be upon them) has been legislated by Almighty Allah for people to observe. Every Muslim must obey all that has been proven to be divinely legislated obligations without considering the immediate benefit of the law on his everyday life since believing in a religion is believing in all what is proven to be part of it. 2. Believing in the Wilayat of the Ahlulbait (peace be upon them) is following them and observing their teachings. This has a great effect on the way a believer deals with day-to-day matters based on the teachings and the guidelines that originate from them. We can see that amongst the characteristics of the followers of the Ahlulbait (peace be upon them) by which they are known today is their condemnation of terrorism and tyranny against innocents, especially children, women and old people, and this is not but a reflection of their attachment with the humane teachings of the Ahlulbait (peace be upon them).