Even if we were able to handle the load on the healthcare system, that still would be a very large amount of unnecessary suffering and death. And even though there are some fundamental issues with working conditions and pay in this area, fixing them would not be enough to be able to handle the load that an exponentially growing viral disease could cause if it remains unchecked. If you do not stop the exponential spread, even with twice the capacity you'd only gain another 1-2 weeks until you're at capacity anyway.
The vaccines work well and are safe. The problem is that too many people didn't take them. There's plenty of problems with how this was organized in Germany, but in the we simply didn't manage to convince enough people to get vaccinated.