Its really not just as simple as "oh but what about the jobs the natives will lose if we don't give them handouts by deigning to visit their lovely little provincial town".
If you live in a town with a high proportion of holiday homes, you start losing your services because the population of your town plummets. Your doctors surgery closes because they don't have enough patients. So does the school and the dentist, and the vets, and all the other things you need. The local budget supermarket closes up and is replaced by Waitrose, which you might not be able to afford. Your vibrant and diverse high street turns into shop after shop selling expensive goods aimed at tourists - high end clothing, souvenirs and expensive art and pottery, outdoor wear, ice-cream and fudge - which is all very lovely I'm sure, but that's not what you, as someone who actually lives there, needs. You need pharmacies and grocers and butchers and opticians and normal clothing stores.
The Scilly Isles council were recently appealling for accommodation because they desperately need a teacher and nurse on the islands, but they couldn't get anyone over there because there was nowhere for them to live thanks to holiday lets dominating the property market.
Try to remember these places are not playgrounds for you. They are actual communities.
Mass tourism is like a drug. It destroys you and makes you dependent on it.