I personally think it boils down to class interests. You can sort of see it in the idea of what Trotskyist types call "Permanent revolution"
They basically believe that ultimately people are -all- interested in their class interests. This allows them to focus on their own because they're "kind hearted", without being hypocritical. A way to combat cognitive dissonance.
It's easy to avoid some imperial treats, but to go your whole life without any imperialist treats, how difficult is that? I don't mean in like a bullshit ultra way. I mean once you achieve class consciousness, from that point forward, can you dedicate your life to the people? It's best to just be honest and say: "Nah today I won't be serving the cause I'll be (insert what you wanna do and why here)" most people will be like this, not everyone can be like Che, if it was possible we'd already be there, because everyone deep down knows we should be helping the people instead of doing escapism, but because such a lifestyle is unsustainable to most people, it's unrealistic.
Ask yourself why do so few people return to the mountains once they find success in the city? It could be because they developed new class relationships at the city, now there's a conflict between that class and the class they've left at home. That's how Brutal life we've created. Such precarious lifestyle destroys peoples willingness to engage with reality and so they refuse to think, then when trouble comes and there's multiple people drowning who do they choose to save? The one they love the most or the one who needs the most help? You will never know for certain, but through studying, learning, experiencing and work, the more you'll learn the more you will be able to identify the correct path, who to save, who to let go, how to keep your loved ones out of harm's way etc. That's all we can lever hope for, to learn, fail and learn again.

You see the biggest mistake Germany made was not using the calipers, They just didn't adjust them properly!