Season 6 Episode 5 Spoilers
I believed kin-slaying in Game of Thrones is a big sin in the North. And all the Northerners respect guest right and see kin-slaying as a big crime. However in Season 6 Episode 5 ("The Door"), Euron publicly accepts that he killed his brother, still he got selected as King by Kingsmoot and after that he says "lets kill my niece and nephew".
Shouldn't the other Iron Islanders have opposed him? Or are Iron Islanders' customs different from the rest of the North in that regard?
Update:- Kin-slaying means killing your own kin/family. Not to be confused with kingslaying means killing your useless king.