Anything that presents one opinion is not going to show the whole situation.
My grandparents talked about it. Some of their stories are shocking-my granny used to shelter in their basement. When they came out one time there seemed to be little damage except one house on the other side of the road. They then found that a watermain had been hit, which had flooded the basements on the other side of the road and family after family had drowned. Whole row of houses with families in.
But you did get the other side too. I remember her talking about where she worked (a bank) and doing a Christmas party for bombed out children, and she did WVS (now WRVS) work and people donating what they could hardly afford to give (and knowing the chances were they could not get replacements either) to people who needed it.
My Grandad was in the RAF and his squadron definitely retained a bond. They still looked after each other in their 80s. I remember them banding together to pay for one of the squadron's grandchildren to have an operation-and a holiday afterwards and that sort of thing.
One thing that I find very poignant, is my Gran on the other side. My Grandad (I never met him) was a desert rat. I think he'd hardly been home since he was called up at the start of war. She was not sentimental at all. After she died, we found the telegram he sent to tell her he was coming home at the end of war.
You do get both sides. No, there wasn't singing in the air raid shelters every night. But there will have been some times.
Just like I've sat through 2 wet days on the centre court of Wimbledon. One day everyone was singing (no, it wasn't Cliff) and getting up and dancing and telling jokes. The security guards were leading it, but people joined in happily. Other day everyone sat miserably in their seats and stared glumly at the rain. Saying one happened doesn't mean the other didn't.
Yes, if you wanted stuff on the blackmarket, you could get it. Yes, people profiteered from the shortages. Still true today isn't it?
For the majority of people, the majority of time it will have been a case of keeping going, feeling the drudgery of every day life. And just like today that will be interspersed with periods of terror/misery and periods of hope and fun.
It's easy to nowadays look at it as being a short period of only 6 years. They didn't know in 1939 how it would end. Mentally that's going to take its toll.
It also depends on how people tell it. Dh had a friend who used to have a room in hysterical laughter when he was telling how he was rushed to hospital with the doctors saying he wasn't going to make it (he had a life threatening condition). The reality was that he was probably terrified, in a lot of pain. But he had a real gift of being able to look for the positive side and tell it in a way that was what you saw. Never knew someone who smiled so much.
Otoh I have a relative that can make a tale of going to the shops sound like the whole world's against him.