We have 9 b’Av because we were crying for no reason, and then we were told we will have the reason. Same about worrying about all the nonsense.
Modern life is full of distractions. In old times, I presu,e. when Babylonian army was coming your way, everyone was scared. Now we had people before WW2 worrying about this and that political silliness rather than preparing for a real threat. You don’t read about that much in history books, as if everyone was talking about important things. They were not, and needless worrying made people miss important things. Learn from those mistakes.