It's not really _supposed_ to work that way, but as it turns out, the safeguards against it working that way don't really work properly. See also Weimar Germany

It's not really _supposed_ to work that way, but as it turns out, the safeguards against it working that way don't really work properly. See also Weimar Germany in particular, but more generally most failed democracies; it's usually due to an insufficient structure.