I'm going out on a limb I suppose, but that isn't how political parties work. Outing myself as an engineer, if I wanted to increase/minimise something in practice I would start with a survey of the academic literature on times where the thing changed radically. Then I would attempt to replicate those conditions. Then I would assess the outcomes using pre-defined measures of success.
No political party works that way. Both wings of policies work near-exclusively with sounds-good-to-people-who-vote strategies. In particular, speaking cheerfully from the right, I've never seen a leftist "minimise [divides] in practice" strategy that looks like it started from a historic survey of what worked. I expect there are similar complaints about the right. I've never seen a political solution assessed for effectiveness, and most of them aren't effective.