I’m not keen. Although the house-price-increases argument isn’t so very compelling to me given that many people can’t afford to buy in the city they grew up in!
We don’t have unlimited space. Everyone deserves a roof over their heads. Second homes (and enormous vanity-project builds) are just such a dreadful waste.
Many second home owners think they “help support local economy” but in reality bring huge amount of supplies with them. EG fill up car en route, groceries and household things brought in, etc. At best, they contribute to low-quality insecure seasonal jobs with non-family-friendly hours (because most visit only during school holiday season odd weekends). Tourism in general isn’t great for employment options, but most hotels/holiday lets vary rates to get better occupancy levels in off-season.
Many (not all!!) second home owners have staggering levels of NIMBY-ism. eg against affordable housing schemes, business that “lower the tone”. An expensive deli? Yes, great. A take-away? God no. Art gallery? That’s fine. A garage specialising in motorbikes? Definitely not. Regardless of the needs of permanent residents.
Symptomatic of our tragically consumerist world. “I want to live in a city AND rurally!”. But it’s very unlikely that anyone who does do contributes to either place (I don’t mean financially, I mean in terms of all the small things that make areas better to live in - kids sport clubs, old folks events, running village hall, etc.). I don’t know any second home owners who volunteer to take a turn helping out in any way whatsoever, and yet they’ll bang on about what a “great little community” there is.
And a side rant: Some second home appear to have run out of ideas as to what to spend their money on. In a world where people go without clean water, basic healthcare, etc. A lot of second home owners can afford it, depressingly often, by inheritance. I see inheritance as unearned, undeserved wealth gain by people who (generally) have already enjoyed all the benefits of having the good luck to grow up in a well-off household (decent schools, etc). It is wrong that people who are already advantaged inherit again through no skill, talent, of work of their own. But that’s not an argument against owning a second home so much as how our society (fails to) work.