Well I had more reasons as my wife is located in Poland so I was looking in Europe and UK.
Though with Entrepreneurship, it is not true that it can't be taught. There are hard skills and soft skills. And a lot of it can be actually trained. Some of the schools have a wonderful curriculum which blends the both.
For eg. Warwick has Leadership Plus module for soft skills and Entrepreneurship specialism for the hard skills. Those who get into Entrepreneurship needs to know how to evolve in a strategic manner from Ideation to Execution. Concepts about Minimum viable products etc. I think these schools cover this pretty well.
It has an incubator plus an accelerator should your idea succeeds through the early phase. It has additional resources such as Warwick Manufacturing Group, and other student led initiatives such as Business competitions to network and pitch in your ideas beyond your MBA classroom. All these resources give you ample ways to network to collaborate to form teams and widen your perspective and access to VCs. Also the alumni networking is great as well.
You are right in the sense that US population has a greater sense of community and networking than other countries (barring some of the top schools in UK) but I think it is evolving.
The other reasons for me to not choose US was the financials (2 years vs 1 year MBA) and my age (which is 32) which doesn't go well with US MBA school requirements. They prefer young professionals. Plus H1B uncertainties. Thinking of spending more than 150k$ and then returning to India after 2 years of study due to visa issues during which my entrepreneurial idea hasn't taken a good shape is not a position I wanted to be in.
BTW few other schools that are well known for Entrepreneurship - Washington Olin (#1 in Entrep.), ESADE