You are comparing uncomparable, the population of India and EU are composed of very different people with different mindsets, expectations, opinions. Indians are generally much more docile (spent 6 months backpacking all around that place, it is really different in this regard).

Also, comparing diversity is tricky - natives from Lappland have 0 in common with say Greek or Spaniards. Same would go for india's extremes, its rather impossible to say who is more different (personally I would still say Europe, since ways of life are almost the same if you look on India east, south, north, west, very similar cuisine etc... not so much in Europe).

We have proven track of how it doesn't work here in Europe, no need to spin another set of wars to re-confirm it.

Also, India sees quite a bit of domestic terrorism in its eastern parts exactly due to mindsets like yours. Not something we like to see here in Europe.