Self-flagellation is forbidden (Haram) in Islam. Great Shia scholars such as grand Ayatullah Khamenei who is the leader of Islamic Republic of Iran and Ayatullah Sistani, the Shia Leader in Iraq, have prohibited any self-mutilation such as self-flagellation with knives or chains (Tatbir) and even walking on fire. You can see their Fatwas (religious opinions) on tatbir.org
Why Imam Hussain pbuh is not forgotten?
The Inferno of Husayn Love
قال النبیٌُّ (ص):
إن لقتل الحُسین حرارةٌ فی قلوب المؤمنین لا تبرد أبداً
The Holy Prophet (S) said:
Surely, there exists in the hearts of the Mu'mineen,
with respect to the martyrdom of Husayn (A.S.) [on day of Ashura],
a heat that never subsides.
Mustadrak al Wasail vol 10 pg. 318
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In Islam, saving human life and helping others against affliction are always enjoined. In the holy #QuranGod says, “Whosoever saves a human life, saves the life of the whole mankind” [5: 32].
He was not an ordinary human being.
او یک انسان معمولی نبود .
او کسی بود که در برابر ستمگران ایستاد و در بین ما مسلمانان الگو فداکاری ، آزادی ، آزادگی و ایستادگی در برابر ظلم است.
ما او را امام میخوانیم . امام به معنی راهنما و پیشواست .