You’re right, but actually a normal-sized black hole (around 5 solar masses or so) would pose no danger a light year from earth because gravitationally, they behave no differently than an ordinary star of that mass. Any star could be an Earth-killer if it wandered into the solar system. A black hole is (usually) only especially dangerous at very short distances, where the tidal forces can “spaghettify” anything, pulling it apart into its constituent atoms, while friction heats and converts a lot of it to radiation before even hitting the event horizon.
In short, black holes are not as dangerous as is the popular misconception, unless the proximity to one is less than astronomical. Then it’s phenomenally more dangerous than just about anything in the universe. The only exception to this is when a black hole is in the process of gobbling something up, which is rare. Then the resulting radiation can be deadly over much larger distances.
How about “tiny” black holes.