Basically, you are reinventing what people like Marx said in the 19th century. Communist states spend a lot of effort on trying to unify people by removing cultural freedom and forcing an ideological and rational system on people. It turns out that trying to do so means that you have to use a lot of violence and have a lot of problems.
As far of listing ideas that created most damage in the 20st century this idea is one of the top ones that lead to millions of people dying. At the moment millions of people in Xinjiang suffer for it.
Even if you think putting millions into gulacs is worth it, because you want unification, there are questions about whether unification wouldn't create more new problems. A unified world order which central governance means that you get a governance system with more maze layers.