... a virus with a survival rate of at least 99.7%, and which has already demonstrates that it can happily bypass any restrictions and carry on spreading.
You're good at quoting figures to suit your views, but what's the basis of that one? Nobody knows how many cases there have been against which to calculate the survival rate. But as you know, the severity of the symptoms ranges from nothing at all to death, and once we reach age 50 the chances of not surviving start going up. So far over 75,000 people in Britain have died as a result of Covid and there are currently 26000+ in hospital with it, with the numbers rising rapidly. Do you really think we shouldn't bother?
Trying to eliminate this virus is as futile as attempting to nail a jelly to a wall
Tiers and lockdown are not aiming to eliminate the virus. They are trying to reduce the rate it is spreading and the numbers being infected.
Not being locked down is the natural state of affairs - someone who is advoating that cannot be an activist.
Plenty of counter-arguments using facts have been offered - it simply doesn't work and just receives simplistic answers like "but people are dying" and "so you think we should just let old people die?". No matter how much it is pointed out that the statistics, worldwide, show little or no benefit from restrictions they won't take any notice - in their view, something must be done, and restrictions are something, so they must be done.
The current situation isn't a natural state of affairs - there's a virus with over 85 million known cases worldwide and approaching 2 million deaths. In that situation, playing with words about whether or not your stance against restrictions is some form of activism is frivolous.
In what ways do lockdowns and lesser restrictions like the tier system not work? They have reduced the rate at which the virus is spreading, the number of cases and the number of deaths. Their effectiveness varies in different countries, because the circumstances vary from one country to another. Effectiveness also varies within a country according to the circumstances at different times. When restrictions are lifted and people start behaving as if the problem has gone away the virus spreads more widely again, of course. That's their mistake, not a failure of lockdown.