In one sense we have never had so much trust - our whole industrialised system requires a kind of unexamined trust at every level: you have to trust that the food you are eating is safe (though in fact it is generally not), that it will be in the supermarket tomorrow (it generally is), that water will be in the taps, that there will gasoline or petrol in the filling station when you need it, that your home heating system will work as the temperature sinks below zero, that the cash dispenser will spit out nice crisp dollars or euros when you need them (working until recently), that the phone system will work, that the Internet will work, that the health care system will work when you get ill or have an accident. Well, Ok, in America the last one is a stretch if you are poor or unemployed, but the other items most people in the rich world take more or less for granted.
However there are many other areas in which trust is also vital where we have become less willing to suspend our disbelief, and none more so perhaps, than that of trusting government, especially, though not exclusively, in America. According to the literature, there was a high point of trust in government around 1960 then a major slide from the late 60s with a few blips of recovery since then.
It is tempting to jump to conclusions when trying to explain the decline in trust - a fall which is widespread across all sectors of society and in regard to all levels of government (and other institutions), and can also be seen in the European Union (especially after the EU Constitution debacle). Trust, however, is one of the most complex and fragile of human relations. Some scholars, such as Adam Seligman, suggest that in pre-civilisation groups it wasn't so much trust but group sanctions that held society, such as it was, together.
On that reading, trust is a relatively new development, and if so, then from an evolutionary point of view, it is hardly surprising we have trouble with it. Be that as it may, we plainly need trust now in places where it is eroded. Unfortunately, it has been discovered that one way to increase trust is to scare people with the possibility of an external attack, real or imagined. This may be part of the explanation of all the recent upticks in trust in government in the last half century, including around the early 1960s, when Cold War tensions were heightened by the Bay of Pigs and Gulf of Tonkin incidents.
It has long been known that a population scared by an external threat tends to rally together, which means that those in power are bound to be tempted to use devices to achieve this end, since it is easier to control a population when it trusts those at the top. It may also be that trust has been manipulated for political purposes in the opposite direction, producing a short-term gain for one faction, but paradoxically causing harm to the greater body politic in the longer run, affecting anyone's ability to rule reasonably sensibly.
Why on Earth would those in power want to reduce popular trust in government? It seems that amplifying or attenuating political trust - or at least trying to - can be used by both parties in America to further their different aims. However, if certain political scientists are right, in aggregate, reduced trust favours those on the right. The reason may be that contrary to conventional wisdom, a more trusting attitude to government can be a cause of a person espousing more liberal or progressive policy views, rather than the other way around.
Since politicians have been trying by almost any means, fair or foul, to influence the people in their favour since the dawn of democracy, and indeed before, any talk of conspiracy theories is quite misplaced. It is rather a complex matter of group and social psychology, and whether it bubbles or ballots, manipulating humans is the name of the game.
This is unfortunate, but in any organised system there will be channels of control, and in any human system, trust will be a vital part of just about anything we do. In the end it is self-defeating to produce a cynical and untrusting populous, since eventually it produces general misery and affects economic activity, possibly to the point of ruination.
Whilst it may well be possible to produce both a gullible and cynical society, I think that all leaders would be well served by trying all honest means to increase the level of trust in society for its own sake. There are after all some countries in which conservatives are the ones who trust government more. Furthermore distrust is a dangerous seed to sow, since you never know quite know where it is going to pop up next and what unpleasant surprises it will bring. In hard times with the body politic in a state of high fever, trust is a vital restorative medicine that should not be used as a mere tool of political expedience.