Of course lockdown was essential.
Britain under so many years of Tory rule (and so many years of the Tories weaponising hatred of disabled people and trying to scapegoat disabled people by pretending the country's financial problems are due to all those workshy scroungers raking in benefits), this country has become an extremely selfish place with no culture of looking out for others.
We don't embrace being part of a society the way countries in Scandinavia and elsewhere do. I've lived in a lot of countries and Britain feels the most harsh, like everyone is just out for themselves and hostile to anyone else. Just walking around the streets, seeing how people barge you out of the way on pavements or shove inside tubes without letting people off, it's just a "ME FIRST AND ME ONLY" mentality that doesn't exist anywhere else that I've lived.
And disability has a huge yet complex role to play here. The government didn't give a fuck about people dying (or about the fact Covid is/was a mass disabling event), they were worried first because elderly people were second most affected after disabled people and elderly people have the highest voting turnout and statistically are more likely to vote Conservative, and second because they didn't want the NHS being overwhelmed and crashing before they could sell it. Which certainly would have happened without a lockdown. And then third they did it for appearances, because they had to be seen to be doing something about a terrifying pandemic killing millions that at the time had no cure and no vaccine, which no one knew much about.
But lockdown was very much framed as "stay home to protect those most vulnerable to dying from Covid", and the government's messaging relied on emotional manipulation and guilt-tripping. So the message was "stay home to prevent disabled people from dying" and that message was never going to go down well in a country that's been brainwashed by years of propaganda dehumanising disabled people. So being guilt tripped into hurting yourself and your family in order to protect a group of people you've been taught to regard as sub-human led to a lot of resentment. Anti-disabled hate crimes rose by 50% during 2020, and I remember lots and lots of threads on MN basically saying "it doesn't matter if disabled people are needlessly killed because they have no quality of life anyway and probably wouldn't live long even if they didn't have Covid."
A lot of people really don't realise that disabled people are just normal people, the spectrum of disability is broad - there are tons of disabled people who work full-time, have successful careers, raise kids, and have the same life expectancy as anyone else. But that's not how we're portrayed in the media.
So basically years of anti-disabled propaganda put out with the intention of dehumanising an entire group, coupled with the country's innate selfishness, coupled with the fact a lot of people were absolutely shafted and ignored during Covid (especially those with MH needs), created a situation where a lot of people's emotional reaction was "fuck disabled people, I'd rather they die than suffer myself" which they then tried to justify by making up comforting lies about disabled people all being doddering and housebound with not long to live anyway.