I volunteer with the elderly. Many of them have lived in the same house for years, some were born in the house, or their spouse was; others scrimped and saved for years to pay a mortgage. In a 'comfortable' area, not particularly wealthy, many of those houses are F or G, with their owners already paying in the region of £4K in Council Tax. It's been pointed out to me that if that should double, people would have to cash in more of their pension (if they can, otherwise they may have to borrow), which will incur 20% tax (or 40% if they will be drawing over £40K, on top of the State Pension, not unlikely if they have highish expenses). So to pay another £4K in tax will cost them £4800, ie total cost of Council Tax around £8800.
I know it's popular to think that such pensioners are very rich and 'have the broadest shoulders', but in my experience, although like everyone, they would love to pass something to their children if they can, for the vast majority, their number one priority is to have a decent pension pot left so that they can pay for any future care needs. They dread 'being a burden on the State'. Some live unnecessarily frugally for that very reason.
Maybe the current government are happy to drain older people's pensions and leave picking up their care costs for a future government, whatever size 'Black Hole' that government inherits.