In Tenerife (the south side tourist area anyway) the locals have been sick of tourists for many years. Apartments there have been bought up by foreigners who either live there or rent them out to other foreigners.

If the opportunity arises to make a good amount of money by renting or selling an apartment which was bought for a lot less in the past then many people will take it., especially if the area already has a substantial amount of people from a different culture who do not speak much or any of the language as the erosion of the community had already begun.

So, maybe if the tourism had been mostly confined to hotels it could have been avoided. I'll bet the government saw an opportunity to tax the hotels, which raised the rates and caused people to seek out other ways to enjoy a holiday.