First of all, there are many millions in Germany, who are neither vaccinated nor recovered (if you have medical proof of recovery, like a positive PCR test in the past, you are treated like a vaccinated person for 6 months). So there are millions which can still be hit by full force. As a consequence, get sick, require ICU care. In some parts of Germany, all ICU beds are currently occupied, patients moved to other parts of the country as we speak. That is the critical situation at the moment. Also, all data available shows, that unvaccinated people are spreading the virus faster than vaccinated people. Those two parts in combination create a situation, where the unvaccinated part of the population do mainly contribute to the severity of things. That is, why the majority of the population cares about high vaccination counts.