For a start, they have bodyguards and rarely go into public without the right protection. They also went through a huge amount putting up security and cybersecurity (like I know one who sets up so many hops between endpoints that Microsoft banned his account). Even most of their employees don't know where they are and where they plan to be, unless they choose to do so. Ofc I guess there is always a way to probe, but people who do random killing rarely has the skills/mental to do that.