The Riff's Alliance wasn't that bad from the short time I knew we ([TME]) were amongst them. The one meeting I did attend of the alliance, was in regards to one of the member gangs having broken the alliances rules of going out and attacking or causing problems with another member gang of the alliance. The discussion was short, and ended in a comedic, enjoyable, and in no way death-matching induced bar fight.
It's the admins decision to do this, but I don't think a ban of all alliances of the sort should be called for. If a genuine alliance that doesn't cause this stuff would arise it should be allowed.