The other guardians. Even my mother and father. I don't think they'd be given the order, let alone particularly want to fulfill them, but I know I'm not going to blindly follow orders and execute people I don't think deserve it. And disobeying any order is generally punishable by exile, imprisonment or death. And exile isn't just 'get the hell out of here', its 'we banish you to a terrible place for X amount of years'.