It's impossible to be protected from everything, but this is different from anything we've seen in the last 100 years -- if we want to take drastic measures against one disease, then this is it. Otherwise, why would so many countries already be in lockdown?
We have seen nothing remotely this deadly, that is also this contagious. Even if the rate of serious illness is only 1% instead of 10%, this is almost certainly going to cause tens of millions of deaths, including hundreds of thousands in the UK. And if the 10% observed in every country's statistics is correct, this could cause hundreds of millions of deaths -- unless all of us act now to slow the spread, including people who are confident of being in the lucky 90%.
Those of us calling for immediate "social distancing" measures are asking everyone to suffer a couple of months' inconvenience and lost face-to-face socialising, and asking the government to provide temporary funding for people who really need cannot afford that. This would not be the end of the world forever, just a pause in certain activities for a relatively short while.
The benefits would be to save hundreds of thousands, if not millions of British lives. Plus, if companies figure out how to get work done by using mobile communications technology, the "new normal" could involve less time commuting and more time with our families and friends after the worst of this has passed.
Is it really not worth making this effort?