We don't actually know if there would have been fewer, or more, or similar amounts of covid deaths without lockdowns, or with different lockdown policies.
There is some reason to think that while lockdowns might have temporarily brought down case numbers, they just went up again when they were eased, and in the end the numbers were pretty similar.
The other huge question is whether they increased other deaths, and whether they will continue to increase other deaths, and who it is that will be affected. If in the end we see that we have large numbers of excess deaths over 10 or 20 years, to prevent a smaller number of covid deaths, that's pretty significant. And whatever some idiots claim, there is a difference between a very elderly person in a care home, whose statistical length of stay in said home is about 18 months even without covid, dying of a respiratory disease, and an infant being born with syphilis and living with the consequences of that permanently. That is not an apples to apples trade-off.
What people are upset about is that the media and certain authorities, and certain sectors of the population, would not allow these kinds of questions to be hashed out in the public space as they ought to have been. There was so much authoritarian control of opinion, with people who brought these questions up being accused of being granny killers and, perversely, anti-science.
There is a lot of reason to think that they got the balance very wrong and that lockdowns will have caused more harm, just in terms of health, without including economic or educational harm or any of that. We don't know yet for sure, but the evidence is not looking good.