The common psychotherapeutic language that has crept into English did not exist before the mid-late 1980s. It just wasn't a part of common concepts. If you take all of that out, you may have a closer view of the way things were. There were other tactics besides 'toughing it out' -- and I think that song is not about being tough at all, but allowing yourself to feel happiness even when things around you are not good, which is a different though allied thing. It's like the Buddhist story of the poor guy who is chased over a cliff by a tiger -- high cliff, big tiger, and he's holding onto a root or branch and in front of him is a strawberry plant, with ripe berries so he eats one and says, "Mmmmm, how delicious!"

I wish I had a good biography of Chaplin -- I know I read one a few years ago -- if I find it again I'll mention it in my journal.