But then, we're not suppose to ask that, are we? Free trade is the answer, no matter what the question is! (/sarcasm)
They're doing what the US did- protecting their economies behind a tariff wall. Eventually, they will have to lower tariffs as their populations get richer.
And the reason their economies are growing so much faster than ours is because they're starting from a much lower level. Anyway, why is it a bad thing if the Indians or Chinese end up rich?