Dazai really does just like to recruit people into organizations, doesn't he.
Like, what's that? A fifteen year old with a toxic relationship to the group that's supposed to be his friends? Have his friends betray him so he joins the Mafia!
What is it, you say? People are after you because you used to be an assassin? Have him join the Mafia!
You're a depressed orphan living in the slums who wants a reason to live? Why don't you join the freaking Mafia.
And this pattern only continues in the ADA, like:
An orphaned dangerous Weretiger sought after by the government? Join the detective agency!
Said Weretiger finds his own orphan girl who is kind of wanted for manslaughter at the age of fourteen? Help her join the detective agency!
He seriously has a savior complex, and this needs to be acknowledged. Don't even get me started on Sigma-