Greg, I don't think politicians are nut cases, many of them are intelligent, but people make the assumption that they are there to work for us. Given the vested interests and the amount of money in the political system it is generally not in the personal interests of politicians to help the general public. There are lucrative side lines in terms of promised future directorships, inside information or plain and simple cash to make it all too easy for them help themselves and
expletive deleted the rest of us. We are often reduced to picking the lesser of two evils and for many the difference between the two is too small to be significant which explains why may of us feel disenfranchised.
Because of this we offered a limited choice at the election and most of the choices we can immediately rule out because even if a party is offering exactly what we want there is little point in voting for a minority party because unless they get a majority, which they won't, they have no chance of implementing their policies.
This can, and has in both the US and UK, lead to what is in effect a two party system. Any other party being largely politically impotent, they are able to help expand the debate but are unable to wield any political power. In effect they are reduced to shouting from the margins.
We need real change and that change is not in the interests of those who currently hold the power. This explains why Jeremy Corbyn is being attacked by the media and the establishment, including most of the parliamentary party in spite of being loved by many traditional Labour voters.