Honest and decent people do not fear an investigation, because they have done nothing wrong so there is nothing to hide.
Honest and decent people do not use their power or the power of others to hide the results of an investigation, because that investigation would have found nothing.
Honest and decent people not use their power or the power of others to suppress testimony in an investigation because that testimony would offer nothing exculpatory and furthermore, witness tampering is a crime.
Honest and decent people do not need to hide their financial information because there is nothing larcenous or criminal to hide.