Assalaamu alaikum Wa Rahmatullahi Wa Barakatuh
If we want to be realistic we need to know that "love" brings "obedience".
No doubt that you and all our Sunni brethren love Ahlul Bait (a.s) and you all really get sad when hearing the calamities and oppressions that went to them.
Insha Allah this love will make you read more about the realities of the history.
Just as a clue I want you to have a research about:
1.The Verse of Wilayah i.e. 5:55 :
إِنَّمَا وَلِيُّكُمُ اللَّـهُ وَرَسُولُهُ وَالَّذِينَ آمَنُوا الَّذِينَ يُقِيمُونَ الصَّلَاةَ وَيُؤْتُونَ الزَّكَاةَ وَهُمْ رَاكِعُونَ
Your guardian is only Allah, His Apostle, and the faithful who maintain the prayer and give the zakat while bowing down.
Who gave zakat while boing down?
2. The verse of Ikmal i.e. 5:67 :
يَا أَيُّهَا الرَّسُولُ بَلِّغْ مَا أُنزِلَ إِلَيْكَ مِن رَّبِّكَ ۖ وَإِن لَّمْ تَفْعَلْ فَمَا بَلَّغْتَ رِسَالَتَهُ ۚ وَاللَّـهُ يَعْصِمُكَ مِنَ النَّاسِ ۗ إِنَّ اللَّـهَ لَا يَهْدِي الْقَوْمَ الْكَافِرِينَ
O Apostle! Communicate that which has been sent down to you from your Lord, and if you do not, you will not have communicated His message, and Allah shall protect you from the people. Indeed Allah does not guide the faithless lot. 
3. The verse of Iblagh i.e. 5:3 :
الْيَوْمَ يَئِسَ الَّذِينَ كَفَرُوا مِن دِينِكُمْ فَلَا تَخْشَوْهُمْ وَاخْشَوْنِ ۚ الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الْإِسْلَامَ دِينًا
Today the faithless have despaired of your religion. So do not fear them, but fear Me. Today I have perfected your religion for you, and I have completed My blessing upon you, and I have approved Islam as your religion.
See the interpretations and see the context for revelation of this verse+ have a search about Ghadir Event and what our beloved Prophet s.a.w.a did on that event.
4.See verse of Mubahala i.e. 3:61 :
فَمَنْ حَاجَّكَ فِيهِ مِن بَعْدِ مَا جَاءَكَ مِنَ الْعِلْمِ فَقُلْ تَعَالَوْا نَدْعُ أَبْنَاءَنَا وَأَبْنَاءَكُمْ وَنِسَاءَنَا وَنِسَاءَكُمْ وَأَنفُسَنَا وَأَنفُسَكُمْ ثُمَّ نَبْتَهِلْ فَنَجْعَل لَّعْنَتَ اللَّـهِ عَلَى الْكَاذِبِينَ
Should anyone argue with you concerning him, after the knowledge that has come to you, say, ‘Come! Let us call our sons and your sons, our women and your women, our souls and your souls, then let us pray earnestly, and call down Allah’s curse upon the liars.’
What was the importance of this incident?

Insha Allah Ta'ala you will find meany new things