Sometimes you have to remind yourself how simple things really are. Business can only work if you make a profit. Its the laws of economics. Buy low sell high! But if you have bought a property and your rent isn't covering the repayments, are you forced to put the rent up? Even if its pricing your property out of the rental market.
In most places demand is outstripping supply so increasing rent may not be an issue. The issue will be whether the ethical police get involved. Ethical police? Who are they and what can they do. Price rises are just a byproduct of inflationary measure to control inflation! Really?