Why did he post it? Why did the attacker choose a CyberTruck?
If we are going to open up on speculation, then it seems reasonable to suspect that the attacker chose a CyberTruck because of Elon's relationship to the incoming administration. In response it makes sense that Elon would highlight the inept execution.
Some partisan responses to the health insurer's assassination have been positive. Even comments on this site seem to be rationalizing the violence. Typically, decent people would condemn terrorist violence as irrational escalation.
Highlighting the inept execution and poor planning illustrates the irrationality of the attacker. If Elon can subtly parlay it into some of the safety marketing or durability of his vehicle, that's an extra win on top.
Compare the narratives:
"Luigi was a smart guy and master planner who read books. Let's plug the author."
"It didn't even break the glass"
Is it fair to say this kind of distortion is typical MAGA? Typical Republican? Is it decent? Why lie?
Fox initially ran with a story the NOLA truck illegally crossed the border with Mexico. This disinformation is intentional, no one is this incompetent. They know their demographic wants to be lied to. Disinformation is the product they're selling. Same with the politicians.
Turtles all the way down. I would say it typifies media across the board. There's also the meta-distortion where partisan sources misrepresent the statements of opposing partisans to present them as dishonest.
It depends on what you mean by 'media', but I think among top-level news media, Fox and ideological fellow travelers embrace disinformation and produce it at orders of magnitude higher volumes, while others make occasional errors.