I'm a tad disappointed that so much of this thread - whose title actually seems to me to have potential - has turned into an 'I don't like x' ercise.
For some slightly more positive heresy, I think politicians are much-maligned.
I don't know any personally, but I think it likely that many if not most are driven largely if not entirely by a desire to do what they can to advance the common good, as they see it. I think good constituency MPs far outnumber bad ones, and most will do their best to help constituents who need help. I think almost all start off meaning well, and a large proportion remain that way. Of course ego and money play their part, but I suspect most politicians, in this country and many others, probably work harder, and for better motives, than they are ever given credit for.