I believe that what we call 'right-leaning' is Yang essence, and what we call 'left-leaning' is Yin essence.
I think that too much right = somebody like Hitler, who shows zero compassion, but he was completely up front with everything he was saying. This is an example of how too much Yang is obviously destructive.
But too much Yin (compassion, softness) can be just as harmful but in a much less obvious way- usually accompanied with the guise of compassion. In order to comprehend the damage of too much softness, we have to understand the butterfly effect. Think about how much wrongdoing is allowed to continue due to the fear of conflict- we avoid reprimanding bad behaviour to our own detriment, and to the detriment of the whole earth.
It may be seen as the greatest act of compassion for the United States military to begin equalising the number of disabled people and able-bodied people in their army. It would make the disabled people feel amazing, as well as their families. To be in the US Army would be a dream come true for many disabled people. And the US would appear to be mature, progressive, and open-minded on the world stage, setting an example for other countries to never discriminate in regards to ableness, and disabled children all over the world would be able to imagine themselves serving their country.
But then our thoughts and feelings come up against reality, and it soon becomes clear that having disabled people on the front line would- as a matter of fact- be disasterous for the US and their allies.
One has to temporarily suspend their compassion for disabled people to argue against having disabled people om the front line. It doesn't take an expert on geopolitics to see how this would galvanise encourage Russia and Amaerica to wrap around America like a boa constrictor. This is an example of where we sometimes have to say 'no' to some people in order to protect all people.
Too much Yin leads to a communist-style environment where, supposedly kind and compassionate people persecute those who they deem unkind and uncompassionate. When we are lead by our rationale, it is less likely to act irrationally than if we are lead by our emotions.
Final thought: too much yin is like suffocating in candy floss- although it's sweet and fluffy, too much of it can be deadly.