Make politicians speak from heart and their party lines collapse up to the extent that they no longer remain in politics.
Massively discouraging their political pretexts may make this also happen although only in principle as their oratory has been a great source of poor peoples’ entertainment. Compulsion of following the party line creates habitual liers, who compulsively go into self-deceiving mode also. While for staying humankind you ought to be honest and kind.
Politics is a very big lucrative business of political bosses that is based on the hard work of their followers who are willing to work even without getting paid for doing so.