Whether you like it or not cars are essential for many people because of the way life has adapted to their availability.
A bit like electricity or clean running water. We lived for hundreds of thousands of years without either, and hundreds of millions of people still do. Their availability has brought huge changes in where we live, how we organise our lives, how we work, play, eat, travel, learn... We could live without them if we had to, but it would be a very different life, because life has adapted to their availability.
And electricity generation, for example, is a huge cause of pollution.
Ban all non-clean electricity production! (and see how well the country deals with rolling blackouts)
I'm all for a long term plan of getting rid of ICE cars, but a simple outright and instant "ban" is farcical. The disruption and loss of life it would lead to until things did eventually adapt would be impossible to sell to anyone, and the active choice that would result in the death of many people, even if it would be fewer than those that will be killed by anthropogenic climate change, isn't one that any politician or majority of voters would go near.
We've shown that major disruption can happen [could anyone have imagined the UKs lockdown situation of the last few weeks, along with furloughing of millions of employees, etc] but it's come at quite a heavy [human] price.
Note that replacing all ICE cars with fully electric cars only lessens and shifts away the pollution elsewhere (which isn't a bad thing unless you live right near the associated power plants) until all power generated in the UK is 'clean'. Until that point the supply of 'clean' energy is limited and finite and so any shortfall in demand is made up for by extra 'unclean' generation. Increase the demand (by replacing ICE vehicles with electric vehicles) and that shortfall increases and so non-clean energy production increases to fill the gap.
In the long term the human race is likely to be wiped out by non-anthropogenic climate change although this isn't a reason to do nothing about anthropogenic climate change, but the action doesn't need to be as drastic as "ban cars!"