As i think gaving an holiday for emam Husain means a lot to Muslim and so to tell them this day is so important to us

To stand against yazid ibne muawiya and tell the world that hassain ibne Ali (pbuh) was always right and should have his special sadness worst death and an extremely bad day to hassain ibne Ali family too and to the whole world as for example when the earth rained blood when that fight happened and when al hassain went down