I don't belive that. I belive you have seen people who say they have good intentions. I simply think they weren't telling the truth. Or they were wrong in obvious ways that that didn't care to hear about.

The problem with politicians is to be one you have to be good at capitalism. Which is amoral at best and immoral most of the time. So the same people that decide them making money is more important than children having food and medicine are the ones that get to make policy. Unsurprisingly all their policy ends up with them making more money and the needs of people unaddressed.

That last thing you said, that sounds nice. However in terms of how the world actually works it is meaningless. The assumption that makes is that politicians simply don't understand how to fix problems. They do, they just are the most highly bought into the capitalist system. The only problem they actually care is fix is how to make more money for them and theirs.