Understanding drivers?

Current logo of the Labour Party
Via Wikipedia

What drives today’s politicians?  

Indeed, what are the drivers for many who aspire to top positions in Public Service?  

If current media coverage (and speculation) around the Miliband brothers, and their ‘fight’ for the Labour Party leadership is to be believed,  I am worried but not surprised…  

BBC News: David Miliband is expected to make a statement later about his future, amid growing speculation he will quit front-line politics. (Read more)  

Don’t you think it strange how someone, who is (apparently) so committed to his beliefs and causes can, suddenly take the juvenile approach of throwing his ‘teddy out of the cot’ route to his political future? Did he really have the inherent social interests he professed to have in the first place?  

BBC News: New Labour leader Ed Miliband has said he will get married, but political events have so far “got in the way”. (Read more)  

Is the sudden development surrounding the importance of ‘family values‘ and social moral issues a genuine change in personal belief or, simply action taken to court popularity in the wake of public condemnation? After all, popularity wins prizes, doesn’t it?  

I am one of those people who is far more likely to respect and believe in someone who is able to maintain their personal values (irrespective of their politics). Someone who affords those values the same level of importance, irrespective of whatever life may throw at them.

How can you be expected to believe and trust in anyone who is prepared to adjust or bury their professed beliefs at the drop of a hat, often simply to court public popularity identified by opinion polls? 

Does our society develop this level of cynicism or, is it naturally inherent?