Anyone who's done the ARR smn questline has already had to deal with a family member who wanted us dead because of what happened with Ifrit. Course they were being manipulated by our buddies in black robes. Those garlean soilders? Most even if they're alone strike 1st. Also if they are 100% Garlean then most bets are off that they will lay down their weapons since even a certain person in the most recent 24 man says something like I'm a Garlean and don't want your help, but I cant stop you from coming along.
The only way I see people turning on us is if our friends in robes do some heavy common folk manipulations and since their leader seems to not to want to do that I don't see it happening. Remember more than once we have given succor to our Garlean enemies after huge fights so if their families ever get word that they're still alive and who helped bandage them up the seed for even a few lower ranked Garleans will know that we're not just mindless murdering machines.