It's in the eye of the beholder where relevant context becomes unnecessary information. Anyway, I'll give my view (on the specific edits).
I think the second edit makes less sense, but it's easier to consider because you made only one change. Specifically, you removed the bold part from the quoted sentence below (original here):
Better data need to be collected, and the voices of Asian Americans need to be heard.
So let's start with that one. You removed a call to action from a quoted paragraph. I'd say the benefits of keeping the quote intact outweigh the downsides. The benefits are, as I see it:
It's how the answerer chose to quote.
It's a quote of a full paragraph, so it reflects the message of the paper's authors.
It goes to the paper's main point. From the abstract, the paper argues: "Offenders’ race and all incident-related variables of hate crimes against Asian Americans, however, differ significantly from those of hate crimes against African Americans and Hispanics." So it's not a call to action reflecting the opinion of the answerer or the paper's authors, it's a recommendation based on the study's findings.
The only downside I can think of is that it might seem as though the answer is trying to make some racially motivated point. I think that's a moot point, if someone carefully reads the answer then it's clearly presenting that call to action in the context of that paper. To do that, the answer briefly describes the methodology and the the results that led to the recommendation.
In conclusion, I'd say the edit wasn't an improvement and it made sense to roll it back.
The first edit is more complicated because you edited multiple sentences. The first part makes sense to me, you removed the following sentence which seems to be needless antagonizing someone:
Now, Hari Singh was a stupid ruler.
It's making a point, though it might be an important one laying the groundwork for the reasoning that follows. I'm not sure if the statement is true, but it would be better if there was some elaboration in the form of examples or analysis from an external source. Editing it out removes part of the answer so it's probably better to be more careful about that. The same goes for your removal of the "realized his own folly clause from a sentence.
At the end you also removed a sentence which provided further context, this one:
Jawaharlal Nehru, India's first Prime Minister, was a Kashmiri Pandit and he has been accused by modern-day "nationalists" to be too emotional with the Kashmir issue.
I'm not sure why you removed that. I agree with the commenters on those answers that it's probably better to vote down and optionally leave a comment explaining that you think something's missing or wrong.
The other edits seem like an attempt at editing out noise, but they don't clearly improve the post. You removed two adverbial clauses: "Obviously," and "In any case," which aren't strictly necessary but they are added to connect sentences and make a bunch of sentences into a story. I don't think edits like that improve the post.
In summary, it seems the edit don't really improve the answer. Partly they're language edits without a clear benefit to the post. And the other part addresses sentence that might need more elaboration but instead of adding elaboration you remove those parts entirely.