The Al Khalifa family is not even a native of Bahrain - they were imported from Saudi Arabia from the accursed Najd region and imposed on the Bahraini people through severe oppression.
While they design policies to severely discriminate against the majority Shia population in Bahrain, many of their policies also harm Sunnis and the general population regardless of differences.
However, in order to slowly erode the demographics of the Shiite population, the Al-Khalifa family imports Sunnis from Bangladesh and other countries and grants them full citizenship if they serve in brutal police forces. They hit two birds with one stone: they use demographic replacement to slowly erode the Shia-held majority, and they have a police force that has no compassion for the natives of Bahrain because they do not share a common religion or land with the people they brutalize.