It's impossible to avoid fumbling things with Wrex during that first backstory conversation -- all three conversation choices say roughly the same thing. He'll warm up to you eventually. Just stay well away from Virmire till after you've completed his Family Armor sidequest. :-)

Yeah, Tali's whole thing about the geth genocide is full of facepalm. :P It sort of inches toward giving the geth POV airtime in later games, but iirc never really reaches "no that was Wrong you do not genocide people you created in order to avoid a moral dilemma about having enslaved sapient beings! what the fuck is wrong with y'all?" ;P

(Also, yay Moana! :D I haven't seen Rogue One, I'm in no shape for everybody-dies stories right now. ;S)