“But you can’t-”
Yes, they can.
We have all experienced incredulity or disbelief at someone’s actions - the actions of someone we love, or maybe someone we don’t know that well at all. And many of us have probably further had the experience of telling people in our lives what they “can’t” ever do again. For better or worse, the other person absolutely can do whatever it is they want or choose to do, and us telling them they “can’t” will not stop them. In fact, it may imply or foster a power imbalance we do not want in certain relationships - those we have with a partner or close friend. Just because someone does something we do not like does not mean we have the right to deny them their agency.
Endings
Endings bring up a lot of things for many folks, and so the end of the year is often both a time for celebration as well as a time of grief. Culturally, the former feels safer and cleaner to talk about than the latter. When people share with their loved ones that they are feeling sadness or grief about someone they lost - whether in the past year or many years ago - there is often a rush (at least in a large chunk of Western culture) to provide assurances, platitudes, and move on from the pain as quickly as possible. It is easier to be mindfully present when the experience is pleasant; when it is painful, we have learned to push away, to avoid. That includes our own discomfort in the face of someone else’s pain - and our own.