Others argue that this simply legitimates their nuclear weapons and that it's a slippery slope. Assumption that we get to make the last move. The US government apparently assumes that we're going to deploy missile defense systems and our adversaries will not respond. It has apparently sold Taiwan on this idea. Some gun controllers and legislators assume that they can ban specific types of guns, and that gunners won't find ways around those restrictions.
Evidence suggests they're wrong.
Assumption that it's ok to have a disconnect between what we teach our children and what we do. We teach our children that violence is an inappropriate response to violence. We teach our children that you can't stop a bully by bullying him. We're taught that even after you drown proof children, they still need constant supervision when they're in or near the water. We are taught not to spank our children, because that teaches them that force is an acceptable way to get what they want.