Its just a reflection of the multi-polar world that we are heading into and BRICS is just an attempt to reflect that. Its addressing the change for the next 50 years.
Besides, it's not like the Western alliance has been so altruistic in its approach towards the 3rd World. Most alliances or even countries are basically self-serving but cloaked in some political jingoism.
You just have to look at the history and the colonial past of the Western nations and see why as the poorer countries get richer they would like to offer an alternative.
The lack of accountability for the crimes of the past -- most recently Invasion of Iraq (otherwise known as Halliburton's search of WMD) goes unpunished. Many in the 3rd World see the West's geo-political intrusions as purely hypocritical.
Personally, everyone's got blood on their hands regardless of whether they are claiming to be do-gooders or otherwise. All sides whether the Taliban or ISIS will always claim they are doing the right thing.
Also, we just have been brainwashed to think in terms of binary choices -- this way it boxes us into simplistic choices. And not look at things objectively. Gamification of politics. Red vs. Blue.
Good guys versus bad guys.
That's the stage we are in.