And if the Trump administration were exterminating people in death camps and had been convicted in international criminal court then you would have a point.
As it is the administration is obviously ignoring its own laws and being disgusting with racial profiling when deporting immigrants in the country illegally, and grabbing legal immigrants and citizens through this overzealousness and rule/law breaking.
The US is not committing a holocaust against Hispanics. It is not committing one against the LGBTQ community either. Even if you believe that the US is capable of committing one here and that it is coming, it is not happening yet and so Charlie Kirk cannot be an execution for propaganda supporting mass murder/genocide that has already taken place.
Execution for crimes that will be committed in the future is execution for thought crime or execution for free speech.