> I think you need at least a basic understanding of statistics
Right -- which is related to thinking in percentages (I almost wanted to say thinking in probabilities, but it's not quite that... it's more fundamental.)
For instance, the age-old question of nature vs nurture. In debates, the answer always into 100% one or the other which makes for a good fight to watch, but in real life we know it's both, and with differing percentages in each situation.
Wading into a slightly more controversial category -- gender pay gaps. Is the pay gap for the same position 100% consistently due to gender? (Twitter will have you believe "yes" but the answer is more complex). Most of us know that pay gaps are due to a series of factors of which structural discrimination based on gender is only one (a significant one, and one that needs to be rectified). But there are other factors like job performance, compensation negotiation skills, visibility of work (results don't always speak for themselves, there's often a need to sell), all factors occurring in different percentages in individuals/groups. Understanding these other factors and the proportions to which they occur and help in devising practical interventions to address them in order to have sustainable equity over the long term.
If we can only switch our mindset from binary categories to multinomial ones, and assign percentages to the contributions of each, we can make moves toward finding solutions instead of just being angry at each other, which doesn't really lead to lasting change.