Where are the guardians of democracy?

With the passing of 237 years, Adams’ very simple sentence seems to have lost its profundity for Western civilisation. However democracy is administered, its essential principle must be defended. 
While Winston Churchill pronounced democracy to be “the worst form of government except for all the other forms that have been tried from time to time”, its problem is sustainability.
Laws are pointless unless applied equally across society and enforced apolitically. Once application and enforcement of the law become politicised, democracy has failed and civilisation itself is threatened.
In a democracy, claimed violation of the law must be accompanied with evidence before any enquiry or action by the judiciary, otherwise the claim is groundless. Well, that is with the exception of the Democratic Republic of the USA. The Democratic Party there has accused the Trump campaign of colluding with Russian authorities to influence the presidential election. While a judicial enquiry is under way, no evidence has been put forward. The enquiry is proceeding simply based on a groundless politically motivated accusation.
Four years ago Thailand disqualified itself as a democracy when the Department of Special Investigation and the police force were clearly politicised. That led to the country descending to the status of a failed state, forcing a military takeover that endures to this day.
Democracy’s weakness is its lack of defenders with teeth.
JC Wilcox