The Tsarnaev Brothers lived in the absolute heart of liberal intellectual America—in Cambridge, Massachusetts, less than two miles from both Harvard and MIT. Therefore, you can be confident that they were never instructed that they owe anything to the country that let them in.
That would be insensitive. Instead, they should display pride in Chechen culture.
Of course, it would be bigoted for anybody to notice anything about Chechen society, such as its ancient tendency toward valor and violence.
These two maniacs come from a long tradition of brave psychos.