Because at a fiscal level, they're not worth it. We don't usually get weather than warrents having them for more than a few days. Just don't drive your car when it's that bad. Simple.
Don't agree at all.
In this country, people still live with the myth that wintertyres are only OK if it's snowing and that the Germans could try to invade any time.
Winter tyres work way better than summer tyres when it's les sthan 7-8C, especially when it's wet... which means 5 months per year.
Also, they do not add to the cost as, unless your Lexus has 8 wheels, you don't wear out your summer tyres meanwhile.
You could argue that you have the initial capital outlay, which will add up to a few pounds in interest. Nothing compared to the safety of my family or even the cost of a repair as per the opening post.