You seem to have missed the point, which is that the decision to murder a large number of innocent people was made by humans at the top of the chain of command, and 'AI' is being used as a thin pretext for that.

The pattern matches various other acts of senseless violence against innocents in South America.

The message isn't "We did this accidentally. We should understand how it happened, so we can make sure it doesn't happen again.".

It's "We do this to make the point that we can, no one can stop us, and if we're challenged we're going to lie about it."