You are on a forum where there are a proportion of elderly, maybe lonely, disabled in any way, bereaved or estranged from family members, who have lost friends, have mobility issues and are in lockdown due to a pandemic.
Which also means a great deal more distance from and little real contact with family and friends and practical problems. With maybe no one to communicate honestly with, I think they have every right to get support, find feedback and to be able to vent frustrations online.
To dictate otherwise is to control and police how people think and what is posted on here. How patronising and superior it comes over, even if the intention is good. We are all capable and indeed I'm certain most people do constantly appreciate the beauty of nature, animals, wonderful friends, sons, daughters, grandchildren, sunshine, blue sky, art etc. etc. etc...each and every day. As have I throughout my life, whether with or without problems at the time. How can you assume people don't?
Most people know how to treat themselves albeit not in the ways you mention, we all know life is much, much richer and diverse than that. I don't think they need someone to tell them to turn the tv on, look out of their windows or zoom. So just open the positive threads and let others discuss their fears or worries [no matter what they are] and find reassurance and connect with others without judgment.