you need one for two reasons the first one, is in case you die, you can leave behind your reasoning, the second one is to try and persuade the masses to rise up. mostly though, it comes down to ego. if someone thinks they're important enough to be justified in murdering a ceo because he didn't personally hand his mom a magical cure-all pill on a silver platter, he's going to be the type of person to write a manifesto.
Denmark