Is the Iranian regime afraid of a strong independant Arab Shia community?

I wonder if there is any truth to this:

 

'This same regime that approved of hostage-taking in 1979, that attacked Saudi and Kuwaiti shipping in the 1980s, that incited suicide bombings and jihadism in the 1990s and beyond, is now the world's most active state sponsor of terror. As to its next-door neighbor, Iraq, the Iranian government claims to be a friend that supports regional stability. In fact, it is a force for the opposite. As General Petraeus has noted, Iran's Quds Force is trying to set up a "Hezbollah-like force to serve its interests and to fight a proxy war against the Iraqi state and coalition forces in Iraq." At the same time, Iran is "responsible for providing the weapons, the training, the funding and, in some cases, the direction for operations that have indeed killed U.S. soldiers."

Operating largely in the shadows, Iran attempts to hide its hands through the use of militants who target and kill coalition and Iraqi security forces. Iran's real agenda appears to include promoting violence against the coalition. Fearful of a strong, independent, Arab Shia community emerging in Iraq, one that seeks religious guidance not in Qom, Iran, but from traditional sources of Shia authority in Najaf and Karbala, the Iranian regime also aims to keep Iraq in a state of weakness that prevents Baghdad from presenting a threat to Tehran.'