It is important to note that renowned muhaddissin have not discussed the karabala incident in detail in the books of hadith (like alkalini, imam muslim and imam bukhari) as it is more related to politics rather than religion. However imam bukhari has given few hints about this tragic incident, and the ppl who were responsible for the tragic martyrdom of Hazrat Hussain Ibn Ali. So what we get about the incident of karbala is through historians (but the dilemma is, there are lot of contradictions in their statements, specially regarding the involvement and role of hazrat yazid ib muavia in that tragedy & most importantly the legitimacy of the khurooj of hazrat hussain ibn ali).
I m sharing a narration that Imam Abu Abdullah Muhamad Bin Ismail Bukhari Al Jafi has mentioned, in his book sahih al bukhari.
***Narrated Ibn Abi Na’m: I was present when a man asked Ibn Umar about the blood of mosquitoes. Ibn Umar said, “From where are you?” The man replied. “From Iraq.” Ibn `Umar said, ***
"Look at that! he is asking me about the blood of Mosquitoes while they (the Iraqis ) have killed the (grand) son of the Prophet. I have heard the Prophet saying, “They (Hasan and Husain) are my two sweet−smelling flowers in this world.”
8.23:
Bk. 73: Good Manners and Form (Al−Adab)
**Sahi bukhari **
And hazrat ibn umer supporting hazrat yazid khilafat even after the incident of karbala. Just before the hurra incident (when tribes of madina revolted against hazrat yazid ) what he said to his family and ppl of madina. so it clearly show they never considered yazid responsible for the tragic death of hazrat hussain.
Narrated Nafi`:
When the people of Medina dethroned Yazid bin Muawiya, Ibn Umar gathered his special friends and children and said," I heard the Prophet saying,
‘A flag will be fixed for every betrayer on the Day of Resurrection,’ and we have given the oath of allegiance to this person (Yazid) in accordance with the conditions enjoined by Allah and His Apostle and I do not know of anything more faithless than fighting a person who has been given the oath of allegiance in accordance with the conditions enjoined by Allah and His Apostle , and if ever I learn that any person among you has agreed to dethrone Yazid, by giving the oath of allegiance (to somebody else) then there will be separation between him and me."
9.227:
**Sahih Bukari **
It has been reported on the authority of Nafi,
that ‘Abdullah b. Umar paid a visit to Abdullah b. Muti’ in the days at Harra in the time of Yazid b. Mu’awiya. Ibn Muti’ said: Place a pillow for Abu 'Abd al−Rahman (family name of 'Abdullah b. 'Umar).
But the latter said: I have not come to sit with you. I have come to you to tell you a tradition I heard from the Messenger of Allah (may peace be upon him). I heard him say:
One who withdraws his band from obedience (to the Amir) will find no argument (in his defence) when he stands before Allah on the Day of Judgment, and one who dies without having bound himself by an oath of allegiance (to an Amir) will die the death of one belonging to the days of Jahillyya.
Bk 20, Number 4562:
**Sahih Muslim **
It is interesting to see that instead of pointing the scoundrel behaviour of the ppl of kufa most of zakirs and many sunni scholars condemn yazid who was a legitimate and competent caliph accepted by majority of the muslims.
Ok shia has got the concept of imamat and they consider imam e waqt a supreme person. But since we sunni have got no concept of that kind of imamat , so we have got no reason to condemn yazid as a murderer of hazrat hussain. Provided that majority of sahaba who was alive at that time neither supported hazrat hussain nor hazrat Abdullah ib zubair (who made a rather serious and planned effort to establish his khilafat unlike hazrat hussain khurroj that was apparently seems to be rather ill planned and supported by of bunch of ppl) when they rose against hazrat yazid ibn muavia.