Why indeed. You can either ask them yourself, or leave it be. As I see it... only those who are motivated can go quite far.

[As he say that, he goes back to collecting some garbage. How much should he say, and how to hint at things to encourage the new member to draw his own conclusions?]

And plenty of factors can affect their motivations. Can you think of what they are?

[If that homeless person is simply watching, without doing anything... What does that say about them? Norimune only wants to see what people can do, if only to avoid boredom on this dreary task.]