Has force ever not been equal to mass*acceleration? No but that doesn't mean Newton was right. Its a good model of physics in many applications but it has its shortcomings. Einsteins theory of relativity is far closer to the answer than Newton's model. 

Are politicians known to be corrupt? Absolutely. Will they continue to be corrupt? Most likely but you don't approach new situations with your biases and then find evidence that matches your world view. You look at every situation indepedentely, look at all the facts, then draw your conclusions. Einstein's own biases cloud his judgement when evaluating quantum mechanics he said "God doesn't roll dice". Yet he was wrong, quantum mechanics is the best model of the atom we have currently.