When should you use inheritance. I can think of one use where it's acceptable and not dangerous. Implementing base class methods that are stateless helpers for sub classes.

But I'm not sure that inheritance is the best way to solve it. You would probably want to use interfaces and static methods instead. Basically I literally can't think of a case that isn't better solved by another way.

Some languages may not give you those other options, in which case, by all means use inheritance. Just make sure you are careful not to shoot yourself in the foot while doing so.