yeah there's a lot of very very skilled people in these kinds of hobbies. A large RC Airplane + Ardupilot can be turned into a cruise missile pretty easily. The HPR rocketry crowd can get past the karman line and active stabilization (basically guidance but just straight up) is a thing now so decent range surface-to-surface guided missiles are pretty doable technically. The fortunate thing is these people also care deeply about their hobby and, besides, they just aren't mass murderers.