How can she leave her country when her childhood friends she takes care of are running around in a dangerous country? [ Besides, he's not sure if Winry would get far away from Amestris. He thinks, at best, she'd be routed back because she's a ~loved one~ of a ~sacrifice~. He's aware that Roy's crew is under very similar circumstances. ]

You could have at least waited so one of us could come along with you. [ Although lbr, those homunculi would've killed anyone else there who wasn't an alchemist so it's not like there's flawed reasoning here. ] Now as for those Porters, with enough plotting and skill we could easily get near it. We've done harder things to protect our great nation! [ Like overthrow the government! ]