Nerys Ghemor wrote:
They tolerate it every day they call the Klingons their most valued allies yet fail completely to call the Klingons out on the conquests and enslavements that they carry out.
Who says they fail to call them out? They pretty clearly condemned the Klingon invasion of Cardassia. For all we know, the Federation is working very hard to change the Klingons' ways through diplomacy, cultural influence and "soft power". (Besides, the original point was that they wouldn't tolerate it within the Federation