[jldl805]

>Part of what makes a good person is their ability to discard (or at least decide to not act on) bad thoughts.

I think this part is really key, and that the quality and characteristics of your "internal idea killer" ends up defining what kind of person you are, in almost all aspects of your life. For example, think of someone you may know that regularly just sticks with their first idea on any topic, or someone you have seen latch on to a mediocre idea for far too long. Now compare them to the person you know most likely to quickly discard ideas and come up with new ones, either instinctively all the time or at the first sign their previous ideas were not holding up to snuff.