Re: You know what really irks me about "Insurrection"?
The Federation was also in the midst of the most costly war it had ever experienced; it's not entirely surprising if they made some moral sacrifices along the way.
Which I think was the point. There are several lines of dialogue in the film suggesting how dire the situation has become due to the war with the Dominion. That the Federation would even consider aligning itself with the Son'a shows how badly they needed another ally. The irony was that the Son'a were in bed with the Dominion at the same time.
"Many things seem clever to an imbecile." --Captain Thelin th'Valrass, USS Enterprise-- "The Chimes at Midnight"