Secondly, Google is a big company and some teams within it wanted to use Dart, whereas otheres want to use vanila javascript and Angular, so now you have both.
Thirdly, Angular is in the process of being broken apart to modular components for 2.0, it also now cross-pollinates with another Google-y called Web Components.
In future, the equivelent of directives (Your own <x-thingy> tags) will be a native web standard, Mozilla is also working on it.
This all amounts to a sort of polyfill to the future and most of the core of Angular will be thrown away if things work out. You won't need it.
These are all good things. I don't understand your need for FUD.