The discussion about avoiding rishus reminded me of a point that Rabbi Frand made in a shiur a few weeks ago. Within the context of a shiur discussing whether a man can dress as a woman on Purim, Rabbi Frand quoted the Sefer Nitai Gavriel which discusses the root of dressing up on Purim. The sefer explained that Jews were occasionally targeted by pogroms which sought to dispossess them of their wealth. Once wealthy Jews would become poor overnight and would need funds from tzedakah. However, these Jews were proud and did not want to reveal their identities. It was for this reason that they would dress up on Purim, the day when no Jew can turn down another when he asks for charity. The now disguised man would come to the door and ask for money so that he could afford the necessities for Pesach, the holiday which starts a mere thirty days after Purim.
The sefer explained that the Jews who saw these men in costume would recognize that these were formerly wealthy people who had suffered because of the pogrom and as a result the donors would give generously.
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