Think about it this way:

If you were a creditor and one of your debtors sought relief via bankruptcy, wouldn't you expect him/her to be 100% honest in his/her disclosure of assets? And, if someone who had no standing in the bankruptcy was aware of allegations that the debtor was hiding assets, wouldn't you appreciate that person (or persons) coming forward to alert the trustee? It falls upon the trustee to investigate the allegations, but he/she can't investigate that which he/she is unaware of.

For me, it comes down to this: The only thing necessary for the triumph of evil is that good men do nothing. - attributed to John F. Kennedy, paraphrasing a quote by Edmund Burke.