Aragonese nobles protected Muslim religious freedom out of material self-interest

Evidence

But Ferdinand at Monz´on continued the well-established Mudejar policy he had inherited; he did what his Cortes asked him to do and swore not to force through conversion of his Muslim subjects. The reason why the estates, summoned to legislate and settle grievances, wished the guarantees of religious freedom for their Muslim fellow Aragonese to be preserved was no doubt that nobles and others among them saw interference with the religious status quo as a threat to their material interests. — L. P. Harvey, Muslims in Spain, 1500 to 1614, 459