Indeed, I think that people in a country should be able to see their national monuments/treasures at a reduced cost. It's pretty likely that at some point their taxes paid for some of it, and making such things only for tourists is lame.

During Covid here (Canada), locals were given free access to national park, and the restricted tourist traffic meant that people were actually able to find camping spots (many of them get gobbled up and pre-booked by tourism agencies/bots). A lot of people realized there was a lot of the country that they had been missing simply because the industry prioritized tourists over locals. If you're going to a country as a tourist, budget and plan to pay as a tourist!