Most Twelvers, what are sometimes called "orthodox Twelvers", do not think that they should be creating chaos to hasten the coming of the Imam Madhi. They think that Muslims should patiently await his coming. The Grand Ayatollah Ali Al Sistani is a Twelver, and except for a brief period of three months when, for internal reasons in the Iraqi Shi'ite community, he tilted toward the Iranian backed Sadrist faction, effectively supported our invasion of Iraq and was instrumental in getting the Shi'ites to accept the U.S. proposed constitution, including super-majority provisions which were being opposed by others as an "infidel trick". He read our history and saw that super-majority provisions in our constitution and in our constitutional adoption procedure were a benefit we had given ourselves and were now passing on to the Iraqis.
The Twelvers who are quite insane are the minority Ta'ajili (sometimes transliterated without the second a) or "Hastner" sect who think that they can and should create the chaos in which the Imam Madhi is supposed to appear. Most Twelvers regard the Ta'ajili as insane, even as you and I do.
Get this straight. (Besides his over the top style, the mistake of regarding all Twelver Shi'ites as Hasteners -- thereby offending the post pro-U.S. factions in Iraq -- is probably the thing about Glenn Beck that most annoyed me until he started backing Romney.)