People tend to not see potentiality as immoral because potentiality is not actuality. To them, a potential event is not immoral, especially if the harm of the potential event is stopped before it occurs. For instance: https://i.stack.imgur.com/BRVkI.jpg
I don't think it would make sense to say that a potential event is actually immoral, and if the harm is stopped, we can't really say it is actually immoral
It's more to do with the metaphysical point that potential things are not actual things. We don't say that people are actually responsible for things they might potentially do, and we don't say that the movement of electrons actually caused an ionic bond which didn't happen, just because those electrons have a potential to do so. In the same way, we wouldn't say that a boulder is actually immoral just because it had the potential to roll down a hill and crush someone
What are the arguments against that?