I mean, in the beginning of the game you're at odds because you're working against Shinra, but as the game goes on both the main party and the Turks are working towards the same goal.
There's even an option to avoid fighting them at some point.
But here's the thing, I never do. Mainly because even though they're cool characters, THEY STILL KILLED HUNDREDS (THOUSANDS?) OF PEOPLE.
Yes, it was on the orders of their superiors, but it was still Reno's hand on the button. Anyway, I'm reading too much into this game again.
From left to right, Tseng, Reno, Rude and Elena.