Fun related factoid: Ruriko had to sign a document when we got married saying that she'd underwrite my plane ticket to the US when she was done with me. (身元保証書; it's the #2 bullet point. moj.go.jp/content/000007…)
#3 is that you're supposed to make sure your foreigner respects the laws, #1 is you're supposed to provide for their living expenses while in Japan.
(It doesn't feel intrinsically wrong to me to ask employers to e.g. post a bond for travel expenses. The outcome the government wants to forestall is "You hire N unskilled or semi-skilled laborers; you go under; we eat costs to repatriate and/or support.")
