I have a similar concept, which is roughly described as "don't extend your own arm onto the chopping block, but make use of other people doing the same". Don't make presumptions, and you will never be wrong. Don't dig holes for yourself. Be kind, respectful, genuine. Don't throw the first punch, but don't let innocent people get hurt. Find common ground. When they extend out their arm, take their hand and guide them towards truth and goodness.

I have a nascent theory about human feelings, which goes that the basic feelings we experience are usually perceived through extensive filtering by our personal, social, cultural, etc., beliefs/experiences. The convincing conscious perception of a feeling may be misinterpreted to an extent. Anger is an emotion that can often become misdirected. Supposedly, sexual arousal can be interpreted in translation from fear[0].

Someone who is suicidal may consider suicide seriously, but feel an urge to live in the process of suicide. Circumstance may make certain feelings clear, but by examining removed from circumstance, the person had the capacity for both feelings. There is some "essence" to the person that those feelings, brought on by circumstance, only scratch the surface of. Observing a narrow range of circumstances and assuming it is the essence is a mistake.

I think that more or less every person, in their essence, understands human decency. It may be that some people truly don't have the capacity to appreciate it (thought: aliens?), but usually, I think the real culprit is learned behavior through various factors, and innate cognitive biases. I don't mean to say that it is easy to change people, because the opposite is generally true, but I think it is worth thinking about.

That said, if there was someone who truly needed to, say, murder the way we need to eat, I say that they would do no wrong by murdering, but that we would do no wrong by apprehending them. I wish to get to people at their essences, not their accidents.

[0] https://en.wikipedia.org/wiki/Misattribution_of_arousal

(Tit-For-Tat: Prefer cooperating, but if the other person defected on the previous turn, defect on the current turn.)

The establishment Democrats are not exactly "aggressively progressive" by any reasonable standard. They shunned Bernie Sanders, who still isn't highly radical.

Given by how we talk about emotions, I think they are "rational", but operate under a different set of rules than we normally apply to "rational" thinking. In fact, feelings are deeply intertwined with our supposedly "rational" thinking, to the point where I don't think there is a significant boundary. The lack of information is prevalent when feelings are in play, and I believe the same is true in general. Even physics feels far different than pure mathematics, after all. Instead of deferring to conventions in how to act when feelings are involved, as if they belong to a wholly different and mysterious world, we can make sense of the entire world. But of course, empathy, kindness, and good judgement are not exempt. None of this conflicts with what you're saying, but I think a subtle shift in mindset will be fruitful in applying it.