Dhamma is generally understood as teaching or nature. Kamma, (often mixed up with karma, a Hindu notion that is close in some aspects, but really not the same) is, in simple terms, cause and effect with respect to an individual. All injustices are a result of cause and effect (at least, I hope you think so) but where I will agree is that it shouldn't be the basis for doing nothing - unless doing nothing is the best choice, and knowing that is the trick, isn't it, Buddhist insight or not.
> Buddhism just abstracts reality into something slightly more palatable that doesn't require as much action on your part.
I can't say that's a good summation of what Buddhism is or does, it might be best to get the basics right (the terms above are a good indication) and then move on to telling others what you think a system is for, or its impact on society… I don't remember Buddha promising a societal utopia but perhaps my memory is deceiving me.
To be even more detailed, karma is the action rather than the effect, which is called karma vipaka. The English word karma means something more fluid - depending on context.
As to the cause and effect part, again, I wasn't about to start on a "there are no causes and no effects, only conditions…" path as it would only muddy the water for the person I'm responding to, but I don't mind the nitpicking, it's a good point and glad to see reasonable challenges in the comments.
Edit, I didn't mean to put this all on the English!
I've noticed when I know the reason for something my anger subsides.
I'm not necessarily arguing that judgements aren't valid, just that they depend on particular frames of reference.
My impression is that Buddhism, like all faiths, has that surface level of justifying why there is evil and how to get free of it - so there’s that inner peace [0] - but there’s also this call to action, to reduce suffering, to work on peace outside yourself - that’s compassion, and Jesus and Buddha were all about it, even if their followers sometimes lose the plot. (I’m too ignorant to speak of Muhammad).
As far as the corruption of religion into preserving social hierarchies goes, I like to think that the capacity to be co-opted by a state is a feature, not a bug: a viral transmission vector. These holy texts might not have survived without a corrupt state maintaining it.
[0] Nellie McKay has a song by this name on her album “get away from me”, it’s a fantastic critique of this focus on “inner peace”