In other words, just being in the presence of patriotic, freedom-loving Americans, regardless of any overt aggressive behavior, constitutes “being in danger” and thus justifies all measures of “self-defense.”
You’re reading it wrong.
The “protester”, who was “protesting”, i.e., attacking, anything Trump, was attacking Mark Hokoana, who is a Trump supporter. Mark Hokana did not shoot the protester. Mark Hokana’s wife shot the protester because she believed, correctly, that her husband Mark was indeed in danger.