Mormon is not completely clear in his description of Mosiah’s reaction to the problem of the persecutions.
Clearly Mosiah pronounces that persecution of the church would end. Whether he similarly proscribed persecution from the church is not as clear. As a ruler we would expect the parallel declarations. However, since Mosiah is clearly a churchman, he may have assumed that. One way or the other, it was clear that there were restrictions put into place that were attempting to restore the harmony and singleness of purpose of the kingdom.
The last phrase of verse 3 is interesting. It can certainly be read in the modern sense of equality among men. There is no reason to believe that it could not have had our very modern understanding of equality before the law. However, it is also possible that Mosiah is describing the unity of the people rather than their legal rights. Given the social disruptions, and the inheritance of Benjamin’s attempt to unify the people, we would expect that Mosiah would similarly attempt to unify his people. The “equality” might not be for rights, but social standing. This may be a call for social unity rather than fair laws.