No, it's very much used to express the sentiment "I don't care about this, and wish people would stop talking about it."

That's your interpretation, and there's nothing in the original statement to support it.

You're welcome to your opinion, of course. Just don't project it onto others.

...which could also be a PTSD-esque reaction and not a sign of ignorance. As in "I'm so tired of being affected by this nonsense, when this would even stop".

People who don't really care would, in my experience, use sarcastic tone more often.

The person might not intend to be trivializing the problem, but that is the common outcome. This was very observable in the wake of the Snowden leaks, where "is anyone actually surprised?" was a key prong in the narrative that argued that you shouldn't actually care about what the NSA was getting up to.