I have to disagree with you @OverandOut123 about the fact about being "Anti Outsider" and that "A lot of Cornwall is very racist". I really hate how this is trotted out. Having lived here for over 20 years, the crap that is posted on "CornwallLive" bears absolutely no relation to how real people that I know behave and think. You might as well say that Twitter speaks for the whole country.
Of course you will find some racist people living here as I believe you will in any other area of the country but this doesn't equate to "Alot of Cornwall is very racist". I find this pretty offensive actually. Would you say the same about others areas of the UK that have small ethnic populations. I live in Mid Cornwall too, and many of my friends and neighbours have come from other parts of the UK to make a life here whilst many are proper Cornish. We all rub along together perfectly well. Yes Cornwall is not very ethnically diverse and this is something that may change over time (and let's hope so). It was quite a shock when we first came as we moved from London.
Admittedly we don't have shopping malls, huge entertainment complexes etc. We do have cinemas, a soon to be newly refurbished theatre (plus the Minack and other smaller venues) and wonderful outdoor places to explore. I guess it depends what floats your boat and that of your family. If you want world class shopping and a bustling multi-cultural vibe then it probably isn't for you. That doesn't mean that people are racists. Most people are perfectly welcoming to others if they live here and contribute to their local community. I also think that there is diversity within Cornwall, in that some places are more traditional than others. And yes you still do meet an occasional older person who has never been over the Tamar!!
As to the tourists - they bring a lot of money and are needed even more than ever. We're pretty near to very popular coastal spots - you just need to know where to avoid and when to avoid (never use the A30 on a Saturday unless it's before 8 am or after 5 pm for example and don't agree to pick up your teenagers at Fistral Beach at 4 pm at the weekend how ever much they plead 
The Simon Reeve programme was very interesting and it was great to have a balance instead of the countless "celebrity tours Cornwall, eats cream teas and pasties blah blah blah" (usually when the sun is shining but there are no crowds anywhere") type of programmes. Of course there is poverty and deprivation and sadly issues that come with that such as addiction and homelessness. I'm not sure how Brexit is going to play out here because so many projects were EU funded. It's going to be interesting ...
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I am not pretending that it's perfect because I don't believe that anywhere is perfect. There is always a compromise. It is quite a long way from big cities and travelling abroad is a bit more costly. However, it was wonderful when my DC were little being able to pick them up from school and be at the beach in 5 minutes on a sunny day.
I have had my moments of wanting to leave (usually in the long, damp winter months) but over the years and particularly over the last year, I have really come to appreciate the peace and nature on my doorstep.
FWIW my DC had a lovely time at a wonderful primary school. Now they are teenagers they moan (show me a teenager that doesn't) and of course this year has been something else. We fully expect them to leave and seek pastures new for Higher education (interestingly at the moment one is desperate to leave, the other desperate to stay) and I'm not sure if we'll be here forever but overall I don't regret moving here at all. Good luck 