No they shouldn't. Terrorism should not be rewarded with sovereignty.
They have their own separate language appart from spanish and their cultural ties are totally different from either Spain or France.
As an American I don't buy into the notion that the determinative factors in nationhood are language or race.
Basque culture is not practically distinguishable from Spanish culture or French culture.
Basques, Spaniards and French all live pretty similar lives in the eyar 2008.
“As an American I don’t buy into the notion that the determinative factors in nationhood are language or race.”
The problem with that statement is that probably 90%+ of the world population does.