Wow, I didn't know they did it OUTSIDE..what an idiotic decision on their part..I hope they think their poses over a little more before deciding to do them in public. If you really must use the Nazi salute, do it in your own private photoshoot - most people will not sit down and just say "Oh it's okay since you're cosplayers!", sorry.
I cosplayed as Hungary and I'm rather glad I avoided the photoshoots this year.
people die when they are kawaii
next con: katsucon 2017