The only thing clear about the shooter's political positions, is that it'll be presented as whatever will be most convenient to the speaker. He held views that individually map across the spectrum, allowing anyone to point to something and assign him at an arbitrary location.
Kimmel’s comments are about the behavior of the MAGA world, and they were true: the MAGA world was trying very hard to push the idea that the shooter was not one of them.
I'm sorry, which details? Why does his opinion about a handful of topics mean that we can infer his entire worldview? Why do we have to assume that his views mapped neatly onto one end of the US political spectrum or the other?
Their behavior indicts all of us Americans.
But of course admitting that and doing something about it means working together, which is a much harder solution than pointing fingers at the other side and doing little else.