Dear Mr./Ms. Bossname,
I am voluntarily resigning from XYZ Company. My last day of employment will be May 31.
My decision was made much easier in light of the scandalous behavior of company executives and the accompanying, valid media coverage. I can no longer dedicate my time, talent, or emotional energy to XYZ given the current leadership.
Before the leadership changes and subsequent atrocious behavior, I was proud of my work at XYZ and considered my role to be a highlight of my career. It is unfortunate that it came to this, and I feel for my colleagues who do not have the financial privilege to quit.