Respect is a two way street. I’m certain that although there will be some dicks, the vast majority of incomers don’t act like the Bullingdon Club on tour.
I agree. Plus, you don't necessarily know in some of the towns that your 'tourists' aren't from nearby Cornish villages anyway. We've heard a lot about all of the tourists bringing in COVID, but has every single Cornish person stayed doggedly inside Cornwall for the whole duration?
I can see that there are a lot of issues in Cornwall - as everywhere - and some may be caused/exacerbated by tourists; others may be closer to home. However, I don't think the mindset that a lot seem to have that it's the tourists causing all of Cornwall's problems is helping anybody. If you live in a beautiful place, you can't expect your fellow Brits not to notice or to ignore it and to leave it exclusively for you.
Places like Jaywick and Blackburn don't seem to be suffering at all from the same amount of tourism and holiday-home buyers, but they have plenty of different problems to contend with. In some of the big cities, teenagers are murdered by other teenagers and it doesn't even shock people any more.
You're at liberty to travel to Bristol, Cardiff, London, further afield at will. Even if you don't go there personally, all of us from smaller places benefit from the international financial power, industry, infrastructure (that only works with enormous, dense populations) - and, yes, also tourism, of the big cities.
If you genuinely don't want to be a part of this - the good and the bad - you need to get together and campaign for independence. If that is what you want, I for one would wish you well and support you in it, although I'd personally very much prefer us all to stay together.