Ethical Companies

It is good to see companies being monitored for ethical behaviour.  However, as always there are question marks about what constitutes ethical behaviour.  Personally I see the treatment of employees as a major part of this and do not consider the "rank and yank" approach to appraisals as ethical.  I don't know whether they still use it but General Electric certainly used to and lo and behold they appear on the ethical companies list!

Shouldn't there be a threshold for this?  Good policies in one space shouldn't be able to outweigh bad ones in another.  After all they are the only company ranked in their sector.  Or is this a case of not being able to agree that "rank and yank" is bad?