Cyril, the problem with your analysis is that it ignores the fact that social injustices very often are latent, hidden beneath the surface, etc. This is what micro-aggressions are, for example.
They’re very often not immediately apparent to the people committing them or to the people suffering from them. And this isn’t because the people suffering from them are too stupid to notice them, but because they’re so ingrained in society that no one thinks twice about them.
Consider a poisoned water supply. Let’s say there’s some chemical in the ground produced by a given community’s staple foodstuff, that’s leaching into the groundwater that has supplied a community farther down the hill with drinking water for hundreds of years, a mineral resource that (on broad average) shortens lifespans in that area by five years (obviously individual cases will be different, we’re talking about averages here). For a long time nobody notices any real difference with their neighbors, because the information necessary for a big-picture perspective on this hasn’t been collected yet. After several centuries, with the advent of modern intellectual and methodological practices, someone collects this data and notices that hey, people in this area aren’t living as long as everyone else. But no one knows why yet, and people come up with a lot of different hypotheses, from genetics to cultural factors (diet, for example) to just pure chance. But these are assumed to either be beyond anyone’s control or something that can’t be changed by anyone except those who suffer from it, so not a whole lot of people are inclined to spend a lot of time worrying about it.
Finally, our understanding of plants and ecology advances further, and someone notices that the plant that these people up the hill are growing as their major food crop, is one that has recently been discovered to produce a herbicidal chemical that gets in the soil–a chemical that, from other research, is known to also negatively impact human life spans. The person who figures this out goes to the community that’s being impacted and tells them about this, and they’re understandably upset and want the community uphill to start using different crops. The same person then goes to the community uphill and says, “Hey, I know you didn’t mean to do this, and I know you didn’t realize you were doing this, but you are doing this and so you need to stop.” They completely lose it, demand to know why they’re being “punished” (they’re not, they’re just being told they need to stop doing something that harms others) and why they should have to go out of their way and change what they’re doing. They then start spewing those old, now-discredited explanations that were put out speculatively before anyone knew for sure, insisting that the real reason for the difference is things like “genetics” or “culture” or pure chance, etc. They’re wrong, of course, but that doesn’t matter because not changing is easier than admitting that they’re the source of the problem and so they’re the ones who need to change.
Then they realize that the person who made these discoveries and is communicating them, isn’t from the community that’s being impacted–in fact, he’s from the uphill community–and so they ask him why he’s inserting himself into something that doesn’t concern him, why he doesn’t let those people down the hill figure out their own problems, etc. Some even go so far as to call him a traitor.
Cyril, your argument against “social justice warriors” (a term I refuse to consider an insult when applied to me) is what those people at the top of the hill are doing.