There are several things wrong with this line of thinking (as others have pointed out), but I'd like to draw attention to a less salient point you made:

> This led to an unusually open society, which had many benefits... with generally higher levels of trust among strangers.

It's interesting that you're portraying the openness of European society in a strongly positive light, given the high levels of abject loneliness prevalent primarily in the west.

Communal living has been a staple for much of human existence, the level of isolation most people in western Europe and North America (and now, much of east Asia) face is a direct result of European "openness" (which spread through east Asia via the British originally, and destabilization + American media later).

The biggest risk to the future of the West is the lack of strong families. That's where India, above all others, shines.