i just want to add that rather than using speculate 'all JP members just turned their back on Rushia'
using that as a reference,
TL; DW: Japanese being Japanese, when seeing someone mostly Japanese. they tend to look away not trying to be involved with someone else problem to save their own asses. except when it comes to the tourist they might start to help due to the feeling of trying to treat a 'special guest' in their country. it even shows japan being on 107th rank out of 114th country in term country who likely "donating money to charity"
that's why when the menhera itself tweet about thanking Kson, I think it Kson having outsider minded or being a normal person, in general, try to help Rushia, since she doesn't have Japanese mentality, and HoloEN member like Calli, or Kiara show their emotion due to this because they didn't think like the Japanese who doesn't want to involve.