So many countries did the same, some had even more severe restrictions/lockdowns. At the time, the scientists/politicians worked with the evidence available. We all watched the TV news of bodies being piled into refrigerated trucks in America, patients struggling to breath in hospital corridors in Italy. We think our restrictions were bad, but paper permits were required to leave your home in say, Italy, enforced by police checking people's permits when seen out on the streets.
I think most people supported the first lockdown, as most people were frightened with the uncertainty of how serious it was going to be, how many people were going to die, who was vulnerable to it, etc. So the first 2/3 months, fine. Yes, very damaging, but limited damage.
I think the problem was that the relaxing of restrictions and then re-imposition was a shambles, as were the "tiers" which were bonkers. None of it made any sense at all after the first 2/3 months of "proper" lockdown. The ongoing costs were insane, as was the economic damage, health damage, educational damage, etc., of nearly 2 years of restrictions!
Those first 2/3 months should have given everyone, organisations, businesses, public sector, NHS, councils, schools, etc the "breathing space" to adjust to a more spread out living and working environment, i.e. relocation of facilities, installation of ventilation, week in/week out working patterns to halve the number of people in work premises at any time, etc. The whole emphasis should have been on "spreading out" rather than banning all contact! That could have been put in motion within those first 2/3 months, and yes, would have cost a lot of money, but nowhere near as much as the hundreds of billions that the restrictions and ongoing lockdowns cost the country!
What I really despair is that it's all forgotten now. Hospital waiting rooms are unnecessary cram-packed again, ill people have to continue to be sardined into tiny GP and dentist waiting rooms, tiny chemist shops waiting for prescriptions, etc. Hospital staff don't wear masks anymore, even in cancer/chemotherapy wards. We've really learned nothing from it.