Dunno about white nationalists striking in the Philippines. A stupid redneck with s buzzcut will stick out like a sore thumb there. My first thought would be the Islamist insurgency from Mindanao. Especially since their president was also shot - we don't know which one was the target and which one was collateral damage. (Well, we do, but people in TTL don't.)
You're trying to use reality and practical considerations. Do you really think the people who will blame "white supremacists" will use those tools when condemning their favorite target?