Stuck on the mission with Your collective, there i was supposed to make an allience, but i cant seem to make the Your to get to like me

. I end up ither whiping theam all out, or they get killed by otheres before i get to them or i kill everyone else, and they still dont wont to make an allience. How am i to do what any tips? (I gess they don't really cear that behind my so colled "Evil" allignment, is beaty and undying kindness, after all,just becouse i like a sentian meal, doesn't make me evil?)