I remember speaking to my Nan about the blitz. She lived at the top end of Canning Street/Upper Duke, and sat on the steps and watched the docks burn.My Grandad fought in WW1 as a teenager, too. He died when I was 16, so I never really had the chance to talk to him about the war, although he may not have wanted to anyway. I can't imagine how traumatic it must have been for him, and in 1918 there was no such thing as PTSD, so many kept it to themselves.
My mum was 5 during the blitz in 1940, when Liverpool was heavily bombed. She told me her bed used to be in the pantry, which was lined with sandbags from floor to ceiling.
In terms of the soldiers returning post-conflict, how it impacts people varies. Non-service people perhaps don't understand there's lots of good from it.
However, understandably, there's also a lot of negative and this is what people see and this isn't only PTSD; you acclimatise to a new way of life and thinking.