Sometimes trade protectionism is good for an economy. In fact it's the strategy all the somewhat successful Asian nations (South Korea, Japan, Taiwan, China) used to get ahead, whereas the countries who followed the neoliberalist model of the west too closely (Malaysia, Thailand, Indonesia, etc) lagged behind. Suggest reading 'How Asia Works' by Joe Studwell.
1. Competition breeds innovation. Monopolies and the like encourage stagnation.
2. How do you know Google would win in China if China didn't block them? Unlike Europe, China is extremely nationalistic. Even if the home brand was slightly worse, it would still probably win the majority of the market. Of course, the only thing stronger than Chinese nationalism is Chinese pessimism so we'll never know.