[z3n]

I agree with this premise, although I am not a doctor.

To be psychotic you just don’t see people as human beings, and you will be capable of flying off and killing someone without remorse, but it’s something else all together to hate people and go with planning and intent and take time (not a simple reaction) to kill as many people as possible.

[Myrddin]

It was premeditated. Al Issa is a devout muslim stewed in hatred for Jews and Christians by his own father. He selected King Soopers (30 miles from his home) as a target. What would inspire that store as a target? King Soopers has a large Jewish customer base and has been running ads inviting customers to get your Passover supplies at King Soopers.

The purchase of the Ruger 556 pistol occurred in fairly close temporal proximity to the release of "stimulus checks". Perhaps that was the source of financing. His family expressed concern that he was unfamiliar with his new purchase an complained of having a jammed round while "playing" with it at home. He used it a mere 6 days after purchase.