What may have prompted Bhuiya's return from Syria was an October 2014 60 Minutes interview with then-FBI Director Comey, who said that Americans who had joined ISIS were welcome to come back home. He lamely warned that "we will track them very carefully."
After being embraced by Comey's FBI and cooperating with the bureau's investigators, Mohimanul Alam Bhuiya eventually received the complete exoneration that he sought in his email — namely supervised release with no jail time (he was facing 25 years in prison).
https://pjmedia.com/homeland-security/flashback-comeys-fbi-embraced-american-isis-terrorist-helped-him-get-justice-department-job/
Thanks Comey.
Pic attached is Bhuiya's letter to the FBI asking for full exoneration.