It is to murder over 50 people and injure 450, only to have authorities claim, within minutes and without any verification, that you are not a terrorist.
It is to commit the largest mass murder and shooting in recent American history, and be described as a 'retired grandfather'.
It is to inflict pain and suffering on others, and not have to worry that a single person of your race, or religion, or your women and children, face any backlash for your crime.
It is to kill (or rape, or loot, or plunder, or colonize...) and get away with it without bringing up irrelevant issues like religion, Scripture, culture, theology or ideology. As of this writing, we still have no idea of the religion and beliefs of the killer.
It is, essentially, to consider any such incident to be a freak accident, and let life continue without changing any policies, or calling for national dialogues about laws on immigration, tolerance of others, gun ownership, cultural differences (such as dress codes), and the list goes on and on.
PS. This post in no way intends to trivialize the tragic loss of life. My sincerest condolences to the families of the victims in this horrible tragedy.