Theres a clear legal route to removing guns from bad guys in a national context. In the US context repeal the 2A, enact appropriate laws and then enforce them.
Theres no comparable mechanism internationally, unless you're suggesting somebody invades Israel and carts Netanyahu and the IDF off to The Hague.
The guns thing is difficult, but you could plot out a path in terms of what needs to happen. With Israel its hard to know where you'd even start with such a plan.