Because who does this? Who is this obsessed with killing one specific stranger knowing that they are committing suicide in the process? Stranger anger is not personal enough to be this highly motivated. Going through the ridiculous clown world process of planning the attack, engraving bullets, and writing manifestos, etc... 99.9% of people lose steam when irrationally and uncontrollably angry, eventually calming down within a few hours or days. Only scorned ex-lovers are this motivated to hold onto death wish style anger like this for days and weeks on end (or muzzies, military personnel with PTSD, disgruntled family members, coworkers, business partners, etc.). And this is why none of us have ever seen or known a Ted Kaczynski or Ted Bundy because for all intents and purposes they are unicorns that don't exist. And here we are in 2025 as The Noticing reaches fever pitch seeing them pop up seemingly everywhere.
Or it was a calm professional sniper intentionally hitting the neck to make it seem like an amateur carried out the attack.