yadda yaddda,
man cannot rule himself if you have an elite set of people applying rules for their own benefit and then seek to have the whole world obey them - when this happensideas of God rule and of God's kingdom come into theirs own. By this means people are galvanised to overthrow what they perceive as corrupt and what they perceive as oppressing them.
I agree with liberal democracratic principles but certainly do not fully agree with the founding fathers, conception of liberal democracy especially to the extent that it was based on the philosophers you mention.
edit:btw please don't take it that I am defending jehovahs witnesses as i am not. what I am defending is the bible principle - man cannot rule himelf - I think jehovahs witness are correct on this but this does not mean as they suggest that we should not participate in politics. ONOH when people appear to reject democracy in favour of God rule it is usually because the supposedly democratic nation is being hypocritcal.