Yeah the rant Azas has found is exactly that. A right wing rant.
The left are unfortunately shit at messaging, whereas the right are exceptionally good at it, and have a very well organised media ecosystem thats able to convince millions of people to believe things that are completely untrue.
We'll no doubt see huge swathes of people believing the shooter was left wing regardless of what the eventual outcome is. I'm seeing lots of posts about him being a groyper, but have yet to see anything definitive from a reliable source. So for now I'm still in the "we don't KNOW what his motivations were" camp.