You are so correct.
The answer to that fundamental question determines what other questions need to be asked. For example, if fundamentalist Islam and its legal extension, Shariah law, are incompatible with the freedoms enshrined in the U.S. Constitution, then Islamic immigration into the U.S. must be halted and all proponents and adherents of Shariah should be deported because their oath of fidelity to the Constitution cannot be fulfilled.
We know all we need to know about this overly durable Evil.