Imam Ibn Taymiyah رحمہ اللہ said regarding the hardships and trials faced by Hasan عليه السلام and Hussain عليه السلام that.
ولما كان الحسن والحسين سيدا شباب أهل الجنة، وكانا قد ولدا بعد الهجرة في عز الإسلام، ولم ينلهما من الأذي والبلاء ما نال سلفهما الطيب، فأكرمهما الله بما أكرمهما به من الإبتلاء، ليرفع درجاتهما.وذلك من كرامتهما عليه لا من هوانهما عنده، كما أكرم حمزة عليا وجعفرا وعمر وعثمان وغيرهم بالشهادة
Since Hasan and Hussain were the leaders of the youth of Jannah, and were born after the Hijrah in the period of the domination of Islam, they did not face the difficulties and hardships that the righteous people faced before them. (the Sahaba who saw the difficulties of the Meccan period) therefore Allah Azzawajal bestowed favors on (Hasan and Hussain) as He willed and wished, through trials so that the ranks of both of them may be elevated.
And that was out of their honor and respect and not out of their disgrace, just as Allah honored Hamza رضیﷲ عنه, Ali رضیﷲ عنه, Syedna Jafar رضیﷲ عنه, Umar رضیﷲ عنهand Usman رضیﷲ عنه through Shahadah
(Raas Al Hussain: 201-202)
Raas Al Hussain (Head of hussain) is the book of Ibn Taymiyah رحمہ اللہ it might be also available in urdu, read this book and you will get to know how and who killed Hussain عليه السلام and who did blasphemy by moving the severed head of Hussain عليه السلام, in this book Shaikh ul Islam described the incident of Karbala.
