It's not blind acceptance, it's the reality, the US maybe didn't 'start' as a two party system, but it evolved into a two party system...if we had a different form of government (see Israel, England, parliamentary systems) maybe you could sustain multiple parties, but those systems have their own issues.
Democracy is the worse form of government, except for every other one.
It's also insulting to say that I would 'blindly accept" it as I was raised by a MA in american history and live with an expert on US history...every time llyndon larouche spends millions for 30 minutes on television i cringe