So American he sounds like a descendant of a Mayflower PilgrimBorn and raised in Texas.
As I said, the MAGA cult's motivations for being anti-immigration is racism.
And any ethnic sounding name is an immigrant according to these people.
Suspect
The FBI identified the suspect as Shamsud-Din Bahar Jabbar (October 26, 1982 – January 1, 2025),[6][11][19] a 42-year-old American citizen born and raised in Texas.