I've read a ton of philosophy and something I don't really understand is that one nation killing another is more immoral than when a nation does this to their own domestic population.

Sure you will get some nay-sayers who say 'a life is a life', if moral particles existed, they might be correct.

But for some reason, humanity doesn't seem to care as much.

What makes intra-state politics more acceptable to use violence?

I can’t even imagine how this could be done. Nazi concentration camps would have had trouble killing that many in 2 days.

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There was a lot of death in 2 days but the revolution started about a month ago so it's not just those two days. I think you could compare Gaza to a single Iranian city, but Iran is much larger than this. Another important distinction is that - no matter what your beliefs are - civilians aren't the target in Gaza, but they clearly are the target in Iran. If the civilians had weapons, it would be a different story.