The theme this passage could support is "It is hard to be an immigrant, even when you have help".
What is a theme?
A theme is refers to the lesson leant or taught by a literary text(story, article, books etc. The theme of the passage is the message or moral or lesson learnt from the passage.
According to the theme of the passage, even if an emigrant receives help, it is still difficult to be an emigrant. Mia's parents were able to sneak away in order to warn the emigrants where they've been hiding, still the emigrants found it difficult to leave without anyone's notice. Jason found them out but he decided to keep quiet about it.
Therefore, it is difficult to be an emigrant in a country no matter how much help you get.
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