Karbala was not Yazids only sin. 2 years later he waged the battle of Harra, seiged the Kaaba for 60 days, threw catapults at it, and broke the hijr e aswad. His sins knew no bounds. There is mass grave for the Shuhada of Harra in Baqi.
Allama Ali Raza Rizvi said "Hussain a.s ko sab mante hai, Hindu, Sikh, yahoodi aur yazeed ko sirf musalman mantay hai" and it sums up today's Twitter's argument
Recite 100x
رَبِّ إِنِّي لِمَا أَنزَلْتَ إِلَيَّ مِنْ خَيْرٍ فَقِيرٌ
Translation
My Lord, indeed I am in absolute need of whatever good You send down to me