When I speak of unity in the Muslim Ummah I don't envision a group of people who exercise their power in an unjust manner. That's not what Islam teaches us.
I do recognize the various extremist organizations you mentioned and their negative use of the term UNITY.
Ahmadi Muslims have a far better ideology of UNITY in Islam. It's about taking the message of The Holy Prophet (p.b.u.h.) and spreading it in the world but NEVER imposing it. The Holy Quran says there is no compulsion in religion!!!
The time when people were converted through the power of swords is long gone. According to the Promissed Messiah (a.s.), now is a time that swords be replaced with pens. If Islam is to be spread, it will now be done through writing not fighting!! That's one of the differences between US and the other sects in Islam.