No man, this is not the reason. I mentioned the reason in my 1st post(1st page). They don't do it because they're scared or because they think or because they believe in it, they do it because they want to feel the pain of what Hussien the grandson of Prophet Mohammed felt when he was killed in Iraq thousands of years ago. (Which is very retarded).
Some information here about Ashoura and Shi'a.
This Ashoura thing started in Iran because in Iraq it wasn't allowed during Saddam Hussien's time. Iranians started this one and they tried to spread it to the Shi'aa people around the Arab world.
Iran regime failed to spread it to Iraq when Saddam invaded them 30years ago(because Saddam felt that they're influencing the Shi'aa of Iraq).
Then they tried to spread it to Shi'aa of Lebanon. And it somehow worked because at that time we were having a civil war in Lebanon, Lebanese vs Palestinians, Lebanese vs Syrians and the situation was really terrible at that time. They spread it to Hezbollah after financing them with arm/money in 1982.
Before that, we never heard of Ashoura in Lebanon until Imam Khomeini took the power in Iran.
Thankfully, very few Shi'aa of Lebanon do practice this ugly show.