Basically there are two groups of people: one group (let's call them 'young people') are not very unlikely to die or suffer from this disease but are very inconvenienced by the various restrictions. Your "We did what we had to when we needed to and the need for such measures is demonstrably coming to an end." really illustrates that. You're unilaterally declaring it over because you're tired of your freedoms being impinged and you're ready to move on. Meanwhile the science doesn't support your view.
And that brings me to the other group (let's call them 'old people'): these people are much more likely do die and don't have that much scope for protecting themselves reliably. Or maybe they can but they have been led to believe in the attitude of the 'young people'. They pay the price for people not wearing masks, not taking the disease seriously and acting recklessly.
And that's the insidiousness of it. One group plays, the other group pays. It reveals something discomforting about our society which we think is highly civilized but really is so casually indifferent to other people's death and suffering.