To vaccinate or not?

To vaccinate or not? TL;DR: Current vaccination rates against COVID-19 seem to decrease and there are indications that the vaccination coverage among adults could be less than 85 percent in a number of European countries. Why would a significant number of people not want to vaccinate themselves, especially now that millions of Europeans have already done so (mostly) without any serious complications? It is important to realize that there can be very valid personal reasons for this!