If we got rid of the Prince of Wales title and got rid of the monarchy as some have suggested, where would we stop? Would the country then get rid of all titles? What would we have then? What would happen to all the treasures; sold off and the money spent on good causes or wasted with little to show for the money? The country might well be in anarchy, with different factions fighting for power of some sort.
History and monarchs have treated a great number of people/groups unfairly/brutally but that is the past. But we have to do what is best for now.
It might well be better to stick with what we have - stability.