Board Thread:Warhammer 40k General Discussion/@comment-14745711-20130821214539/@comment-3580035-20130902012317

Surviving Imperial soldiers from the Damocles Gul Crusade left behind in the Tau Empire were given their own planet, on which they lived the rest of their days believing in both the Greater Good and the Emperor.

The sterilisation thing only appeared in the non-canon ending to Dark Crusade. It has never been repeated or shown elsewhere.

There are very few instances of Tau performing immoral acts. During the Taros Campaign, the worst thing they did was force captured Imperial soldiers into mining work, and even then in not so bad conditions. On the other hand, when 100 Tau soldiers were captured by the IG, they were all dead the next morning.