Just as divine-right monarchies required forbearance, so do democracies. Think of democracy as a game that we want to keep playing indefinitely. To ensure future rounds of the game, players must refrain from either incapacitating the other team or antagonizing them to such a degree, that they refuse to play again tomorrow. If one's rivals quit, there can be no future games. This means that although individuals play to win, they must do so with a degree of restraint. In a pickup basketball game, we play aggressively, but we know not to foul excessively - and to call a foul only when it is egregious. After all, you show up at the park to play a basketball game, not to fight. In politics, this often means eschewing dirty tricks or hardball tactics in the name of civility and fair play.