Which is definitely why the media is posting his picture and personal details everywhere right? To make sure other people aren't persuaded to seek fame in the same way.

He was a self proclaimed Pedo Hunter

Here is my irresponsible speculation: kid did it to get back at his dad. Dad was a republican flying trump signs in the yard, mom is registered democratic. Kid grows up wearing hunting outfits to school, trying to get on the shooting team, getting bullied (even after that time he tried to fit in by getting on the antitrump bandwagon following j6), trying to be the version of manliness his conservative father believes in, seaking his father's approval, and paying the price socially with his peers. But as much as he tries, and fails, to get dad's approval, mom is always there for him. Mom is a dem, probably secretly, with dad forcing strict "traditional" family roles (hence the signs in the yard, mom probably didn't agree with but was powerless to stop). Kid seems to fit the stereotype of young man, bullied in school, working a dead end job, few if any friends, no future to speak of, just generally mentally unstable, ripe for suicide by cop alreadt. Then something happens, dad hits mom, dad cheats on mom, dad screams at kid calling him a loser and also yells at mom for rasing a mommas boy, something like that. Kid snaps, betrayed by his father again, but also protective of his mom who was always there for him. Kid decides rather than killing his dad (either because of unshakable childhood fear, or a desire to cause more pain to his father then death would afford), he would kill something his dad loved more than anything, more than his dad loved his mom, and especially more than his dad loved him. He'd kill dad's god king Trump, and go out along with him. His dad would lose his hero, and the world would know his dad was responsible because he failed as a father, and thus his father would be the greatest traitor to the Maga movement ever.

I base this on no evidence other than the couple of facts we know about voter registrations and the yard signs and the like. Again this is just my speculation, which it is completely irresponsible to engage in right now (fun though!).