My niece has a good maths degree and a very highly-paid job in finance. But her 'emotional capacity' is a little skewed, and she finds socialising difficult. She often doesn't 'get' what people are talking about, and has some 'off-centre' ideas and philosophies.

I can't see what 'Jews or Immigrants' have got to do with Aspergers.

In the case of immigrants, the UK Gov information does state that linguistic capacity is necessary. Obviously, a juror must be able to understand what is going on during the trial.

It is indeed dangerous for a juror who hasn't got the mental capacity to be playing a part in deciding a defendant's guilt/innocence. A long prison sentence or an inappropriate failure to convict are both dangerous.