Define "compulsion".
>Define "compulsion".
From the link given earlier:
The practice was a method of self-preservation for the Shi'as who historically were the minority and persecuted by Sunni Muslims. Sunnis would sometimes force Shi'as to curse the House of Ali - believing that no devout Shi'a could commit such an act. As a result of this persecution, the idea of Taqiyya emerged. In other words, if a Shi'a Muslim's life is in danger, he may lie as long as he holds his faith true in his heart.