If a democracy wants authoritarianism Nationalist Party then there is no magic mechanism to stop this, and it might be presumptive to even assume that democracy is most morally harmonious and effective configuration of society. I believe China is seriously contending this assumption, as it races ahead of its Asian and European neighbors with respect to economic optimism.
Also, political parties appear part and parcel with democracy, but that part of the discussion is so often left unloved.
China is certainly effective. The willingness to simply murder dissidents makes things much simpler. I struggle to see how anyone could consider China "morally harmonious" though. Their effectiveness seems to be directly at the cost of any morality.
Also, political parties appear part and parcel with democracy, but that part of the discussion is so often left unloved.