Certainly part of it can be religious disagreements. Members of Baha'i are certainly a very threatened minority within Iran, and that should be a primary human rights concern for those who are paying attention to human rights violations in Iran.
As for other considerations, the IRGC was formed in 1979, right after the revolution, to consolidate the revolution and to fight anybody who was counter-revolutionary. Religion and politics are all mixed up together. So anybody who is actively working against the revolution's ideals and the Iranian regime is going to be at risk in Iran.