Why is the average citizen forbidden contact with foreigners?
The citizens of Oceania are forbidden contact with foreigners on pain of death. This is because the state is worried that, if they allow their citizens to establish contact with foreigners, then they will realize that they are people just like themselves.
If this were to happen, it would be incredibly dangerous to the regime's continued rule. For the Party's grip on power in this one-party dictatorship largely depends upon inciting hatred against a common enemy, including foreigners. The citizens of Oceania are encouraged to hate the nation's foreign enemies, who are routinely demonized by Party propaganda. But if they should ever establish contact with such people, then they'll quickly begin to realize that the picture they've been presented with by the Party is based on nothing but lies. In turn, this will serve to undermine the very foundations of the parallel universe, the "sealed world" that the Party has painstakingly constructed, and on which its absolute power is based.
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