Yes cause they've got a good synergy going, and everyone likes them.
You know what else they have in government? Other voices. In the US, all I see are republicans and democrats. There aren't any libertarians in senate. There aren't any greens in the house. That's not a problem in Germany.
Face it, you want to live in an old, broken, backwards system for whatever reason. You don't want to have a better government, you just want a shit one that does what you want.
Well, to be fair, America's old, broken, backwards system has accomplished more in the past 100 years than the rest of the world combined
European style systems tend to be weaker but allow for a more inclusive government. While this benefits minor groups and third parties, it comes at a sacrifice of efficiency and power. I'm not saying one is better than the other, but just providing perspective.
This is also a cultural thing. For example, the scene of a car crash. In America, first responders will show up, and someone will take command of the situation. That person will then run the situation giving orders until someone more qualified (or powerful) arrives, and then that person takes over the situation. In Europe, first responders arrive, and they will collectively discuss the best path forward. Once agreed, they will separate and accomplish their individual tasks, occasionally regrouping when others arrive and to make further decisions.
America's system allows for immediate action and fast results. Europe's system allows for broader perspectives and more input. America's system also means it can go very badly very quickly if the wrong person ends up in charge. Europe's system allows for critical information to get buried in meaningless data, and has slower responses.
In terms of governance, America's system provides strong, fast results at the exclusion of minor players. Europe's system provides inclusion of minor players with weaker, slower results. And honestly, it's going to stay this way in America for a looooooooooong time, for alot of different reasons.