Look at these two groups of numbers and see if you can work out which is bigger. When it comes to hospitalisations, big numbers in the middle of winter are bad and little numbers are good. If I sound frustrated, I am
A: 200, 400, 800, 1600, 3200, 6400, 12800, 25600, 51200, 102400 = 204,600
B: 200, 400, 400, 400, 800, 1600, 3200, 6400, 12800, 25600 = 51,800
But winter doesn't end in 10 weeks. More like 18-20 weeks. So what happens is in your scenario B, Jan and Feb see the 51200, 102400, 204800, etc. figures. That's why people are asking what the point is.
That fact that the UK has seen such a quick and large second wave is a sign that it came out of lockdown too quickly or didn't implement and/or actually follow strict enough control measures once it did so. Yes, other countries made this same mistake, but plenty did not. Saying "but Spain fucked up too look at them see look" doesn't alter that fact.
So then it comes down to a new lockdown only really achieving anything if the government and we the people do better post-lockdown than we did last time. That we do something differently to avoid the exact same thing happening all over again, but with a 28-day delay.
And that is where the "it's pointless" crowd come in. Because people have absolutely no belief in that. The government's handling of the whole thing has been such a shambles, nobody has any hope that they would do anything better if they have another shot at it.