Knowing the right thing to do offers no value if you don’t apply that knowledge in your actions.
If you find yourself reasoning that it is “not my problem” or that “someone else should be doing this” you have become an official bystander. To know what to do, how to do it and when to do it and not act from that knowledge, makes us so.
It is obviously much more complex than to always step in to act with what you know. There are conditions that need to be understood and numerous variables to be considered as well.
A simple offer to help is a great way to start.
A role in good character would be to discern by action, and not by inaction, to learn the parameters of helping in a situation to add value with another.
“Silence encourages the tormentor, never the tormented.” — Elie Wiesel —