An unrestricted tourism industry in a second wave will increase infection. We saw how the first wave spike was flattened out: there was a lockdown and mobility was minimal. It's the only way to get on top of it, so tourism will have to wait again.
The structural problem is that the UK economy is skewed - a disproportionate amount of people involved in service industries requiring face to face contact.
I know it's convenient to talk about 'the industry' rather than individual people, but for every industry that is allowed to die or told to wait there are tens of thousands of individuals affected. It's rent not paid, bills not paid, closure of business, closure of local services, increase in support mechanisms needed.
And completely locking down isn't 'the only way to get on top of it'. We live with risk all our lives, and even where there is a pandemic, it can be managed with the right systems in place that we mitigate as much risk as possible.
Sticking with Blackpool, there are around 25,000 full time jobs in Blackpool that rely on tourism. It's tourism industry is valued at around £1.6bn. There is evidence across multiple disasters and emergencies that the perception of problems and reputational damage in tourism is often worse than the actual difficulties faced and it's possible the perception that it cannot open successfully, on a town so reliant on tourism, would cripple it. It's missed the summer season and it's now set to miss the autumn and winter season.
Equally, I doubt it's inhabitants are interested in a debate as to whether the economy needs a shift at the present time. Perhaps as part of the learning when we begin to fully recover but really many can't wait and hope that investment is made in diversification.