I still want to believe that funds were spent properly, but things definitely don't look nice. Even if they spent all money for good case, this is not how things should be done. If you decided to make charity campaign, publicity and transparency should be main thing. After all, all these money were donated by people, it's not your own property. If I would do such thing, I would try to keep receipts of every purchase and add record of it to spreadsheet. Because it's not enough to add vague information that $50 were spent on potato or $100 on rice without any receipt.
What I unlike most in this situation that these users don't bother to reply to accusation properly and seems that they don't give a shit about it. And coincidence or not, but soon after accusation they become basically inactive on forum.