That's exactly what I was hoping for, thanks for putting words to it. We got a taste of that in Enemy Within, with Exalt being human (albeit evil). It still felt a bit strange to gun them down with alien weaponry. Why were they doing this? They were people, they must have had some reason... And then their rampant meld-usage, pretty well timed with the player's (or in my case, amputating wounded heroes into emotionless mecha) and you really start to wonder if Shen's silly "Oh nooo, what if we adopt too much alien technology"... was actually spot fuckin on...
"We did what we had to do! For Earth! An entire alien invasion obliterated, and the Ethereals! We had no choice. The long war... It's finished."
And then we're
teased a game where everything is sooooo much worse. The situation is beyond FUBAR. Even humanity itself is against us. Only our tiny faction of extremists, the remnant of a failed project, insist... beyond all evidence... that the aliens have some malicious plan. They MUST, don't you SEE??
And of course they do, but we have no idea what it is. But we know they do, and we have to stop it... No matter who stands in our way.
So it was kinda disappointing that xenos were so common (I was expecting 1-3 a mission as minibosses, not for them to become more common than Advent). Advent's nature was even more disappointing. But it was also disappointing that public opinion wasn't a thing at all.
I guess I wanted a Liberal Crime Squad against Xenos...
Come on, surely there's some mod that addresses these things? They hyped the game on this general idea, and it's supposedly so moddable.
Edit: I think I failed to summarize my point: XCOM as renegades should have gone much farther, and darker, to save Earth than in Enemy Within. Because the situation is almost ridiculously worse... Plus, they're already completely vilified in the public eye.
Basically, we should have become EXALT. But to save the world... right?