I find this thread a bit strange, to be honest. Do we need people to show their feelings? Well, yes...I think we want to know that people understand and respond to the pain of others. As human beings, it seems quite natural to expect some sign of empathy towards people in the throes of grief and pain, and we are understandably doubtful of people who seem incapable of showing warmth towards those who are suffering.
I don't think anyone expected May to break down in floods of tears over Grenfell Tower but it seems to me that any normal human being reaches out towards people in pain and, if possible, tries to comfort them. Corbyn has been criticised for hugging people, as if that makes him a phoney, but it just seems a human thing to do. Ditto the Prince, who naturally hugged an old lady grieving for her husband. I'm not trying to make this political - I'm a republican with no time for the monarchy but, at least, they tried. I don't think emotion comes naturally to the Queen, on account of her upbringing, but she did make the effort to look as if she had some inkling of what the survivors were going through. I'm afraid Theresa May just comes over as robotic. Maybe it's her manner but it's also the result of her opinions.
As for celebs, if lending their names gets publicity - whether it's for fund-raising or for campaigning - is that such a terrible thing?