You told them or you explained and developed a plan? This is all hypothetical, because immigration also creates jobs, but to somebody threatened with losing their job, it doesn’t help that they know that the king is to be blamed.
My assumption is that they believe that a unified society can change the decisions of the king. How do you convince them that the immigrants are on their side?
BTW, it doesn’t matter that the king has the majority of surplus. The problem is that he doesn’t use it to employ everybody.