I've got to say I disagree with you there, Khris.
First of all, the graph shows infections, not deaths, so the "triangle of death" label is rather misleading. Nor is it a given that the curve would follow a linear trend to zero. An exponential effect, gradually flattening to reach some stable level, seems more plausible in the case of non-intervention, all things being equal. Nevertheless, it is no doubt true that lifting the mask mandate leads to more infected people, and that a few of those people die.
However…
The virus has become endemic: we will never get rid of it. In particular, the Omicron variant was so virulent that it could not be contained by any reasonable measures, they would just slow down the spread ("flatten the curve," remember that?). So there will never be a point where we can lift mask mandates and other restrictions because we have "beaten the virus."
This leaves us with a choice: adopt mask mandates and other restrictions permanently, or say that we have done all we can: we have vaccines, we have a milder version of the virus, and it no longer threatens to overwhelm our healthcare system. Therefore, now is as good a time as any to end the restrictions. A stable rate of infections may in fact be preferable, because it provides a degree of herd immunity that means sudden spikes and outbreaks of new variants will hopefully be less dramatic. (Dropping the mandate also makes it possible to re-impose it if it should become necessary, while the alternative is probably increasing non-compliance that makes it unavailable for future use.)
Early on, idiots were saying that COVID-19 was no worse than the flu, and citing numbers that ignored (a) that the pandemic was just getting started, and (b) that those were the number of people dying even given the lockdowns and social distancing. But those objections are no longer the case, and now it can be fairly said that as long as people get vaccinated, COVID is comparable to the flu. Yes, some people will die of it, but it's no longer one of the great problems facing our society.
Of course, this doesn't mean that the precautions we learned during the pandemic should not be practiced, particularly isolation for people who are sick.