Inspiration comes from so many sources. Music, other fiction, the non-fiction I read, TV shows, films, news reports, people I know, stories I hear, misheard words or lyrics, dreams... Motivation? The memory of the rush I get from a really good writing session - even on a bad day, I know I'll find that again if I keep going.
I don't know about happy endings, because I don't think, eventually, anything is happy. You feel a bout of happiness with good news. Five minutes later, there could be a traffic jam or a phone call from an irritating relative or a weird thought, or it could be a tweet that annoys you, and your emotion will flip immediately.
Trump is unloved in his own house. A figure of ridicule, a theatrical creation, he is almost sympathetic. He was told by the greedy and the outright stupid that he would make a swell president. The Liar's Paradox has spun out of control, with liars lying to a liar who believed the lie. What would that be called? Fox News, I think.