You already listed the trade-offs. You still care about the company and those there, but are also concerned about harming your own career. In your own position

You already listed the trade-offs. You still care about the company and those there, but are also concerned about harming your own career. In your own position: I would be as honest as possible in a professional, data driven way, and keep it to the point. No names. E.g. Concerns about operating and maintaining systems that didn’t fully finish the design and security review process or whatever the case may be.